Hayaryuu

"Kamitani-kun who always looks calm, had shown a really hurt expression which i've never seen before. My family... may be differ from Kamitani-kun's, but this kind of thing is definitely wrong!!. No matter how hard we try, we'll never be able to meet with our parents again. Why is that, even though they're so close to each other, he has such a cold face when he's talking to Kamitani-kun? He doesn't even visit Taka-kun. I don't get it."

- Kashima to Kamitani's father

Hayaryuu is the slash ship between Kamitani Hayato and Kashima Ryuuichi from the School Babysitters fandom.

Canon
When Kashima met Hayato for the first time, he thought that he was "that type of person" because he was being a bit harsh with his brother, but then changed minds as Kamitani said that he had to check for Kashima's brother too.

In the moment when Kotarou got sick, Kashima immediately ran right to Hayato and asked him if he could guide him to the nearest hospital, since his little brother catched a fever. Kamitani didn't think twice, and left his little brother in care of his mother and helped Kashima, giving the right direction to the hospital. The next day, Kashima thanks Kamitani for helping him and then went to class. While he was introducing himself, he was nervous at that time, but after he saw Kamitani, he calmed down while smiling and made to finish his introduction without worrying.

Anime moments
When Kashima was heading to his classroom, he felt uncomfortable of the people surrounding him and thought that they were giving him a "stare", thiking it was him that he was getting many weird stares. When he got to Kamitani, he asks him if he had something was wrong with him, Kamitani asked in response about why he was tagging alongside with the kids right behind him. Ryuuichi panicked and apologized to everyone surrounding him and then asked Kamitani if he could help him taking the kids back to the Daycare center, which Kamitani accepts the offer.

The next day when the kids with Usaida and Kashima were going to an excursion, Kamitani passed right where they were and then he asked Kashima if he could leave his little brother in his care, which Ryuuichi accepts and then he asked Kamitani if he apologized to his little brother already, since he had hitted him before. Kamitani said that he didn't really liked him and then his little brother overhears it and ran to another place of the excursion with Kotarou. Before Kamitani left the place, he told his little brother to not causing problems to Kashima and everybody else, showing that Kamitani cares about Kashima first than another people. After the excursion, both guys are showed up walking together back to their places as both were carrying their brothers from behind, while they were discussing about Kamitani's situation with his little brother.

In their P.E class, Kashima asked Kamitani if he was cold, which Kamitani said in a sarcastically tone that he was really cold that he could die, while his face said another thing which Kashima grins nervously. Later, when Takuma and Kazuma were calling for their father, it's seen Kashima and Kamitani holding them.

The next episode, Ryuuichi it's showed with an invitational poster in his hand for the Gakuen Club. When Usaida asked Ryuuichi and the kids if they wanted to check out the other clubs, they agreed and Taka suggests that they would see the baseball club (where Kamitani was) too. As they finish checking out the other clubs, they went directly to the Baseball club, which Ryuuichi notices that he was there and then Taka tries to call his brother, and when Kamitani notices that, he just ignore him and then he cried out loud. Kamitani punches his brother when he went directly where Ryuuichi and everybody else were and Kashima apologized saying that it wasn't his intention for interrupting him while he was in his practiced. Hayato said that it was okay, that his club was weak anyways. After everybody left the Baseball club, Kamitani tells to Taka not to disturb Kashima which Taka yells and says that he doesn't bother him.

When Kashima was distracted by looking another club thinking that they were having fun his little brother notices his big brother's mood and when Kashima asks Kotarou if he wanted to go with him to stick the poster, he rejects the offer and Kashima shocked about the answer, because he didn't expect it. Kashima arrived to the place he was going to stick up the poster, he then kneels down thinking that maybe his brother didn't want him around. As he was distracted with his negative comments, he suddenly get hit in his head and when he was out of his thoughts, he saw Kamitani with his brother in his arms and then asks if he could join the club. Kashima was a little confused and thought that he was going to join the Baseball Club, which Kamitani says that if they were talking about that, he would accept it, but they were talking about another club. Hayato gives Ryuuichi the membership to the Gakuen Club and then he said apart that [Kotaro] invited him to the club. Once Kamitani hands Kotarou to Kashima, he explained that Kotarou was dragging him and then Usaida interpreted the situation. He also said that Kashima looked miserable and Kotarou thought that he helped dragging him to Kashima. After that, Usaida made matching aprons for both guys with their names.

In Inui's incident, Kashima asks Kamitani his opinion about adultery, Kamitani asks in response that if that wasn't something for the people involved to decide. Kashima complains that they're talking about an affair about someone who has a child already, which Kamitani replies back that it was their problem at the end of the day, Kashima stays in silent after he said that to him, pondering about his past when a similar event happened in his childhood.

When Kirin and Taka were fighting about if witches and heroes were real or not, Kamitani was about to say neither of them were real, Kashima shuts him with his hand covering Kamitani's mouth saying that he don't have to destroy the children's imagination. Later, Kamitani tells Kashima that he have to tell them already that both witches and heroes aren't real but Kashima says that he don't want to destroy the child's dreams. Also, he says to Kamitani that he might believed in that kind of stuff when he was young, or maybe not. "Oh yeah, i tried to practice a launch that disappears, but someday i will make it, so that's different".

When Ryuuichi forgots his lunch, Kamitani asks him what did happen that he was a little concerned. He said that he forgot his lunch in the Daycare center, and told him not to speak while his mouth was full. While Ushimaru offered her food to him, he rejected and then Usokawa and his classmates gave him mountains of food like their "feelings" toward Kashima. Kamitani pats Ryuuichi's shoulder while saying: "Aren't you lucky to have classmates like that?" which Ryuuichi replies to the "praise" with: "Kamitani...". Meanwhile, when Kotarou was giving Kashima his lunch, his classmates worried about Kashima's full belly, and when one of them was about to complain in high voice, Kamitani shuts him with a bread he had somewhere, showing that Kamitani doesn't want anyone to hurt either Kashima and Kotarou feelings. Next, when they arrived to their class, Kamitani asks Kashima why is he walking around with an apron, which Kashima notices and asked Kamitani why didn't he tell him if he noticed. Also, Kamitani adds that Kashima's butt was full of stickers. Saying that he's surprised that he couldn't notice while the kids were adding stickers in his butt, Kashima blushes really bad and he complains that he could tell him about those things earlier.

When Kashima received a love letter, Kamitani checked out first to affirm if the letter was just a prank or not, showing that Kamitani worries about Kashima feelings and that he would check out his actions that could hurt him or not. Later, when Kashima thought that he losted Kotarou, Kamitani appears with Kotarou in his side saying that he went into someone's yard for getting a lemon. After Kashima rejected the girl who sended him the love letter, Kamitani asks if he was sure, that he seemed excited about it, while Kashima says that he wanted to keep his brother as the primary priority.

In another episode, we can see Kamitani calling Ryuuichi asking if he was free that day because they were going to a festival with their brothers, which Kashima says yes and then both guys passed their phones to their brothers so they could invite each other personally. When they arrived, Kamitani asked Kashima why was him and his brother wearing formal clothes (yukatas) which Kashima says that Saikawa and Obaa-san prepared it for them.

There were a lot of moments of them and their brothers in this episode like; they went to buy cotton candy to their brothers, catch golden fishes and more things. When Taka loses his sword, Kashima proposed to find it, which Hayato almost disagrees. Before doing something, Kamitani told Kashima that he should go back to enjoy the festival, because Taka was causing many problems, but Kashima says that even if he isn't in the Babysitting Club, he would search the sword. "We're friends, right?". Kashima said that unconsciously and he was wondering if he was the only one who thought that they were friends, which Kamitani replies; "You're really incredible. If he wasn't my brother, i wouldn't even take care of such a troublesome brat". Kashima got surprised at his answer, but at the same time, his comment made cry Taka, after that, Kashima tells Hayato to stop making him cry. After that, they went in a search for Taka's sword in all the festival, even if doing that would be hard and would cause many problems. When they were about to give up, Kamitani told Taka that he had to give up. Taka hesitated but Kamitani said that in exchange, they would bring him to the Rope Game and told him that he has to bear with it. Ryuuichi it's showed to be moved by Kamitani's words and then Hayato said that he needed to thank Kashima for helping him finding his sword, that he would be given up if Kashima didn't suggest them to find it. After they found it in the Rope Game, the guy in that game apologized and give in exchange a Coin bank with a PS3 style to them.

In the beach scene, it shows Kamitani and Kashima chatting along while they were in the water. Kashima told him that it wasn't his first time going to the beach with his brother, saying that Kotarou was still a baby so he doesn't remember it, and that he didn't trust him at all because in the past he used to not being afraid of swimming. Right after he said that, Kamitani hits Kashima's head and Ryuuichi complains about it, but Kamitani then told him that Kotaro wasn't afraid that time since he was clueless baby who understood less than now. After he said that, Kashima felt relieved a bit while he agreed with Kamitani.

When Kashima saw Taka with a bloated face, he quickly asked Shizuka (Kamitani's mother) about his status, she shows him a ball with a "poo-like" scribble in. He quickly assumed that maybe Kamitani hitted him even harder this time, but surprisingly, Shizuka said that Kamitani ignored Taka after that. Also she asked Kashima if he could check out Kamitani, which Kashima accepts it. After Kashima convinced Kamitani to talk with him, he wanted him to apologize Taka for what he did, even if he rejected at first, Kashima explained that he understood that feeling on not talking to his brother again. Kamitani seems somewhat interested on Kashima's story and he asks if something similar happened to him. Ryuuichi then explains everything that Kotaro did ever since he was a baby, and that once he threw his phone to the toilet which had his parents' messages before the tragedy and the he wouldn't get them again, Kamitani then pats Kashima's shoulder trying to cheer him up. Hayato said that in his case, it was the opposite, explaining that he really didn't care about the stuff but the intentions of Taka, but in the end he had to deal with it. After school, both brothers made to reconcile, and then it's seen the brothers plus Kashima and his little brother too walking back to their places.

In the parents meeting, the kids rolled Kashima while he was wearing a cob's outfit, which Kamitani soon appears right in the entry and wonders about the thing blocking the way. Kashima replies that it was him and asked Kamitani if he could help him to get up.

In other episode, Shizuka asks everyone if they wanted to see chick eggs hatching, everyone agreed with happiness while Hayato apologizes to Kashima that his mother got them excited, which one turns to Kamitani with shinning eyes. Kashima got nervously altered by his own reaction explaining that he wanted little chickens to follow him around in a line while Kamitani replies that the already had the kids for doing that so.

After Usokawa invited his friends also Kashima and Kamitani, Kashima arrived first and then Kamitani. Kashima asked Kamitani what was that bite mark in his cheek, Hayato told him that his brother insisted on going to the cinema with him and he then bite him. Kamitani also asked if Kotarou didn't cry, which Kashima denies saying that he was quiet when he left the residence.

In Chirstmas Day, as Kamitani was about to say to Taka that Santa wasn't real, Kashima covered Kamitani's mouth with his hand for second time saying that if he said that, he would destroy Taka's dreams. Kamitani went to the chairwoman's office, excusing Kashima by saying that he was going to skip class for the day, to ask Obaa-san that if she could buy a new phone for Kashima, which lady accepts and in the end of the episode, it's seen the chairwoman giving Ryuuichi the phone that Kamitani asked for.

Manga
While they were going to take a photo in the Parents meeting, Kashima asks Kamitani where his father was, Kamitani says that he is divorced and it's a person that Kashima already knew, which made Kashima question to himself about that person.

Next day, as Kamitani and Kashima were heading to their classroom, Kashima said that he thinks he's forcing a secret out of Kamitani, he then says that he didn't plan to keeping it from him. When Kamitani retires from the teacher's lounge (where his father, his chemistry teacher, Hebihara Taizo was), Kashima notices that he had a "really hurt expression" he never saw before, and when he entered to the teachers' lounge, he gives instead of a reflection, he gave Hebihara a summary about the stories of Kamitani and his brother in the Daycare center, showing how much Kashima cares about Kamitani's feelings and also his family.Next day, after Hebihara gave back both guys report cards, Kashima noticed that in his report the letter and the photo were gone. Kamitani then asks Kashima with an angry tone about the photo and the letter that Hebihara left on his report letter, which makes Kashima panic about it, but that in the deepest of his heart, he knew that Kamitani was thankful about that, even if he didn't show it physically in that moment.

In chapter 35, with the Inui's Incident, when he fell in love with "Inomata" (Ryuuichi disguised as a girl), Ryuuichi wanted to clear the misunderstanding by telling him the truth being dressed as "Inomata". Yayoi also asked Kamitani if he could help Kashima by acting as "her" boy. When Inui arrived to the scene, Kamitani started to talk as "Inomata's" boy, while Ryuuichi was panicking and saying in his mind that Kamitani was being too stiff with the lines. However in the end, Ryuuichi failed to clear up the misunderstanding.

While Kashima worried about that Kamitani didn't answer his call, he noticed thanks to Kousuke that he thought he could hear Taka's voice in the background telling Kamitani to not putting a step ahead to the house. He inmediately concluded that Kamitani was freezing while being stuck outside of his house, and then Kashima ran to Kamitani's house to see if he was okay. When he arrived, he rescued Hayato from his "death" by opening the window of the balcony where he was freezing.

While the kids were writting their wishes for the Tanabata, Kashima asks Kamitani to write a wish too while Kamitani declines, but later, he changes his mind and put his wish in a paper then sticked it in the Tanabata's tree. As the wish was coming "true", Kamitani complains that he doesn't believe that it was coming true just by hanging his wish to the tree. Kashima seems not understanding it and Kamitani says that he wasn't listening at all and added that he didn't believe even for a second that his wish came true just for the Tanabata's blessing, that he wanted to go as far as he can with the team he had. Before leaving the Daycare center, Kashima said that he was going to leave it as it is, that everyone was saying that his luck was also part of Kamitani's skills and he wanted him to do his best, hoping that it would cheer Kamitani with his words.

As Kashima, his little brother, and Saikawa went to a grocery shop on chapter 58, they noticed that Kamitani was there too with his brother. Saikawa invites Kamitani and his brother to Morinomiya's residence where Ryuuichi was staying, after dinning right there, Kashima lend Kamitani a room where he can stay and after that, Kamitani spent the night in Ryuuichi's place.

When both guys went to the New Year festival, Yayoi asked both guys if they could dress like Mikos, because she would be busy which Kashima accepts and Kamitani said that he couldn't say anything fine from now, which Kashima apologizes to him for making a decision without asking him. They're both seen later with Miko's outfits while attending to the clients.

In the moment that Kashima defended Yuki getting him by a snowball which Hayato throwed, Kamitani apologized and added that Ryuuichi's pose that made for protecting Yuki was really suitable for a outfielder, which Kashima said that he don't have to change the topic but thanked him for the praising.

When Taka ran out of his house, Kamitani tried to call Kashima unsuccessfully, then some minutes later, Kashima checks out his phone and noticed that he had a losted call from Kamitani and Ryuuichi calls him again. When he picked up the call, Kamitani said that there wasn't time, but Kashima wanted an explanation about his situation. After he tells about the his situation, Kashima offers to help and right before Kamitani would say anything, Kashima cut the call. Then, a moment later, Hebihara found Taka and brought him to Hayato and Shizuka, Kashima said for himself that Kamitani's family situation perhaps was complicated, but it wasn't pretty difficult as he thought.

In Ryuuichi's birthday, Kotarou told everyone to say Happy birthday to Kashima while hugging him, between those people Kamitani was included too. After bringing the cake, Kamitani heard Kotarou explanation and, despite he was a bit confused, he did what Kotarou said and hugged tightly Kashima like Kotarou told him while congratulating him on Kashima's birthday, and Ryuuichi, a little flustered, thanked him for it.

Manga

 * Kashima grabbing Kamitani's arm in chapter 10.
 * In the chapter 54, Kashima said that if Hayato and him were brothers, he would be depressed by the fact Hayato it's good in sports, while Kashima not.
 * Kamitani dragging Kashima to the bus in the chapter 63.
 * Kamitani rolling Kashima's sleeve in chapter 73. (Also later, he said that Kashima was pretty good saying good things too).
 * Baby Kashima and Baby Kamitani playing baseball in chapter 84.
 * Kashima pulling Hayato's shirt after Kamitani included Ryuuichi in the people who does he likes in chapter 85.

Quotes
"I really like the team i am right now. Also you, and the little brats at the Babysitting Club. Besides, Taka's too spoiled. I can't leave you and the old hag and go somewhere else."

- Hayato to Kashima in chapter 85.

"If you ever dare to hit [Kashima] when you talk to them, i'll send you flying to the sky."

- Hayato to Inui in chapter 43.

Fanon
A common joke it's that fans love to say about Kotarou being the wingman of this ship because his several moments Kotarou made Kashima and Kamitani closer, and they joke that in the Festival scene they went to a "double date" with their brothers. Also, they joke that Usaida might ship them too because of several moments he did almost the same thing as Kotarou. This ship can be shipped alongside with Inomaru, also, this ship have a rival too: Inuryuu, which one doesn't have a big popularity, but it's a really known ship in the fandom.

On AO3, it's the most written ship in the School Babysitters fandom as well as the most written ship for both characters.

Fandom
FAN FICTION
 * H. Kamitani/R. Kashima on FanFiction.Net

TUMBLR

Trivia

 * Kashima said in total 186 times Kamitani's name throughout the manga.
 * In the chapter 25 of the manga, Usaida told to the kids that he wouldn't chase after Kashima and Hayato, later adding: "More like, they're all 'lovey-dovey'."