YuuYoi

"I won't kill my friend. And Yoichi won't kill me, either!"

- Yuichiro to a possessed Yoichi

YuuYoi is the slash ship between Yoichi Saotome and Yuichiro Hyakuya from the Seraph of the End fandom.

Manga & Anime
Yuichiro and Yoichi met each other in Chapter 2. Yuichiro was the one who saved Yoichi from his bullies, Yoichi seems admire Yuichiro for saving him. After Yuichiro saved Yoichi from his bullies, Yuichiro ask's Yoichi why these guys were bullying him, Yoichi answer's that they weren't even bullying him. Yoichi then say's that he asked one of the bullies for a favor. The favor to join the Demon Moon Squad, Yoichi say's that he want's to join the Demon Squad because he want's to avenge his dead sister. Yoichi then explains that his sister was killed by vampires and that he was paralyzed with fear and that he can't forgive himself for not saving his sister. Yuichiro then hit's Yoichi with Soda can and ask's him, why he's even blaming himself and that he just would have gotten himself killed by trying to save his sister and say's that he did the right thing. Yuichiro then also say's to Yoichi that he should forget the army and that they have no need for spoiled weaklings like Yoichi.

Before Yoichi could answer, a part of the school explodes and an announcement comes, that a vampire has escaped from the vivisection laboratory. Yuichiro then screams that he will kill the vampire alone and runs away. Yuichiro then fights against the vampire that was just about to suck a girls blood, but Yoichi runs in the room and stops the vampire from sucking the girls blood with hugging the vampire firmly, Yuichiro then cuts of the hand from the vampire and say's that Yoichi isn't that bad after all. Yoichi who trembles, say's that Yuichiro is his friend after all, which gives Yuichiro a flashback from his Orphane family.

The vampire then attacks Yuichiro and falls with him out of the window, Guren then kills the vampire and save's Yuichiro's life. Yoichi then runs out of the school and hugs Yuichiro happily and say's that he's happy that he's still alive. Yuichiro then loses consciousness and wakes up in a hospital bed with Shinoa and Yoichi at his side. Shinoa then proclaims that Yuichiro is now officialy a member of the vampire annihilation force and say's that she and Yoichi will now be his partners. Shinoa, Yoichi and Yuichiro then put theirs on top of the others and Yuichiro admits that he looks forward to being partners with Yoichi and Shinoa.

In Chapter 3, Yoichi runs on the roof followed by his bullies, Yuichiro sees that Yoichi's bullies were behind Yoichi and ask's Yoichi if he has gotten bullied again. The bullies then ask Yoichi if they can be Yoichi's underlings, much to Yuichiro's suprise. Yuichiro then ask's the bullies if they really have the nerve to ask, Yoichi who'm they were bullying, to be his underlings. Yoichi then say's to Yuichiro that he's going to far.

Yoichi later is worried about what the other Moon Demon Army classmates will think about him and ask's if what will happen if they get wrong impression of him and Yuichiro and start bully them. Yuichiro say's that he will protect Yoichi from his bullies, Yoichi ask's if he would really do that for him, Yuichiro say that he of course would do it for him. Yuichiro then smirks evily and say's that he will beat them up to pulps and that he will show them what he's capable too, which makes Yoichi worried.

After Yuichiro gets his school scores back, Shinoa bullies him for his bad scores, Yoichi encourages Yuichiro with saying that he was held in a Vampire City as child and that his bad scores are only neutral. Later in the Chapter, Yuichiro tells Yoichi leave because he isn't strong enough. Yoichi disagress and say's that he need's to stay because he needs power to avenge his dead sister, Yuichiro then wonders himself in his mind, if Yoichi is the same as him to.

In the final exams to get a demon weapon, Yoichi gets possessed by his demon, Yuichiro was the one who convinced everyone to not kill Yoichi. Yuichiro then fights Yoichi, in the hope that he could bring Yoichi back to himself, Guren say's that it's to late for Yoichi to come back, Yuichiro doesn't hear and say's that he won't kill one of his friends. Yuichiro then speak's with Yoichi and say's that he won't kill one of his friends and that Yoichi wouldn't kill him either. Yuichiro then screams, that if he likes him, has watched his family dying, then he would never kill a friend. Yuichiro's and Guren's final word's seem to bring Yoichi back to his sense's. When Yuichiro sees that Yoichi has come back to his senses, he hug's him and pats his head and say's; "welcome back".

Yoichi and Yuichiro then both join the same squad that Shinoa leads.

After a long time Yoichi sees the vampire again that killed his sister, he then has a speak with his demon Gekkoin, his demon tells him that he should kill the vampire, named Lacus Welt. Yoichi refuses to do so. Gekkoin then tells him that Yuichiro is using him for his plans to get his family back. Yoichi answer's that Yuichiro is such a nice person. He also say's that Yuichiro would do everything to protect his friends and to get his family back. Yoichi then also say's that if he wouldn't had become a part of Yuichiro's family, despair and hopelessness would have overcome him and that he would've been dead by now. When he finishes to talk with his demon, Yuichiro ask's Yoichi if everything is alright and Yoichi answers that everything is okay.

Seraph of the End: Vampire Reign
"Oh, come on, guys! Yūichirō's always been a nice guy.""

- Yoichi to his squad while the others are teasing Yu

"Well, um... Ever since Ferid injected Yuichiro with that medicine, he's started acting like his old self again." (To Yuichiro) "It feels like ever since your demon took over, you've been getting colder and colder toward everything..." (To the group) "I guess what I'm saying is our situation isn't as completely bad as everyone thinks it is. Yu needed medicine, right? Now we have that medicine. Not only that, we learned it might be possible to bring people back from the dead. If that's true, isn't that some very good news...?""

- Happy that Yu is better and placing matters into perspective

"Because Yuichiro is such a nice person! The whole world is empty and broken, but he refuses to give up! He keeps trying his very hardest to get his family back and to protect his friends. That's amazing! Really, really amazing! If I hadn't been lucky enough to become part of his family when I did, I'm sure despair and hopelessness would've swallowed me up and I'd be dead by now."

- Yoichi to Gekkouin about Yuu

"Yay! Yay! Yaaaay!! I'm so happy to see you're alright, Hyakuya!"

- Yoichi to Yuichiro

Fanon
YuuYoi is one of the more popular Seraph of the End ship's. The ship sailed as a result of, Yuichiro's and Yoichi's friendly interactions and close friendship's. Despite YuuYoi's popularity, the ship still get's overshadowed by MikaYuu and KimiYoi.

On AO3, the ship currently has over 70 works, in its tag.

Fandom
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Variations

 * KimiYuuYoi refers to the ship between the two and Shiho Kimizuki.
 * Shinoa Squad refers to the ship between the two, Shiho Kimizuki, Shinoa Hiiragi and Mitsuba Sangu.

Trivia

 * When Yoichi's design was first created, he was depicted with black hair. This was most likely changed due to his resemblance of Yuichiro.