RyuSae

RyuSae is the slash ship between Ryusei Shidou and Sae Itoshi from the Blue Lock fandom.

Canon
Shidou and Sae were temporary teammates on the team for the Blue Lock Eleven vs. Japan U-20 arc. Shidou showed deep interest in Sae many times, and the two frequently flirted with each other throughout the arc. Shidou and Sae frequently flirt with one another, like making suggestive innuendos and comments, and using playful nicknames.

Japan U-20 Arc
The arc starts off with Ego Jinpachi naming the eleven starting players for the Blue Lock vs. U-20 match. Ego states that even though Shidou is the second-best striker in all of Blue Lock, he had zero chemistry with the other players and that there is not a single player in Blue Lock that has the ability to understand/ handle Shidou’s personality or playstyle. So instead of Shidou playing for the Blue Lock Eleven as a starter, he was specially handpicked by Sae Itoshi to join the U-20 team.

Their first introduction to each other is when Sae tells Shidou that Blue Lock is too small of a cage for him. He tells Shidou to hand over his ego and go wild for Sae’s sake. Shidou first reacts angrily but is much more intrigued by the end of the scene.

During the second half of the match, Shidou is finally subbed in. He and Sae pair up instantly, overwhelming not only the other team but their own teammates as well. A fellow U-20 player Oliver Aiku even comments on how Shidou and Sae are a match made in heaven.

After an incident with another player, Shidou is rewarded with a free-kick opportunity to score. During this, he and Sae work together to plan the very best route Shidou can take to score his goal. Sae encourages him to think outside of the box and imagine his very best goal rather than the “realistically possible” goal. Shidou quickly comes up with his ideal goal and tells Sae that he says very exciting things. Sae tells him that this is the time to dream and to fall under his spell. Shidou responds by asking if he’s Cinderella now, then say’s he’s falling in love. Together, Shidou and Sae score the goal.

After their goal, Shidou compliments Sae on his assistance. He tells Sae he likes him and asks for his number. Sae says he’ll give it over if Shidou scores a hat trick (a hat trick is when a player scores three goals in a game). Shidou now looks even more excited than he was before.

After a pass from Sae to Shidou, Shidou compares playing football with Sae to the feeling of electricity pulsing through his brain. Sae asks him to elaborate, and he answers by saying that he doesn’t really know, but this is the first time he’s ever felt that his freedom has been understood by someone. Shidou blushes and comments on his excitement again. Sae reminds him that he still needs to score his goal before he gets too excited.

After Shidou scores his second goal, his teammates run toward him to congratulate him, but he ignores them and runs straight for Sae to jump on his back. He declares that he wants to play football with him forever and that with Sae he feels a ‘special sensation’ he's never felt with anyone else before. Sae reminds Shidou that he needs to score a hat trick before he’s rewarded, and even goes as far as calling Shidou a horny demon. Shidou responds to this by asking Sae if he can move in with him if he scores ten goals.

At the end of the U-20 match, Shidou scored his required hat trick and reminds Sae of his promise to give Shidou his number. Sae responds teasingly by asking if he can at least shower before he gives it over.

Manga
"I want your ego. Go wild for my sake."

- Sae to Shidou, Chapter 109.

"...Itoshi Sae chose not any of you here, but Shidou Ryusei instead."

- Ego Jinpachi to Blue Lock, Chapter 109.

"Go wild, my little demon. You and I are going to be this game's headliners."

- Sae to Shidou, Chapter 122.

"Shidou Ryusei, who even Blue Lock couldn't rein in... We'll finally find out the reason why he was picked... We'll be able to see 'The Egoist Desired by Itoshi Sae.'"

- Ego Jinpachi, Chapter 126.

"Looks like those two... Are a match made in heaven."

- Oliver Aiku on Shidou and Sae, Chapter 128.

"While Blue Lock was unable to handle Shidou, he managed to grasp Shidou's vision and answered in kind with a flawless pass... I'm sure those two are are only just getting started-"

- Yoichi Isagi on Shidou and Sae, Chapter 128.

"Hey Itoshi Sae, that was a nice pass. Playing football with ya is pretty damn fun."

- Shidou to Sae, Chapter 130.

Fanon
is the most popular ship for both Shidou and Sae. The pairing attracts most fans due to the very intriguing character dynamics the two have with each other. The very explicitly obvious interest and attraction they have with the other has even fans who don’t usually partake in shipping viewing them as a couple. Most fans believe Shidou and Sae officially started seeing each other after the U-20 match when Shidou got Sae’s number. For many, their flirting and banter is very enjoyable to read, and is refreshing for a character like Sae, who tends to be very cold and distant from other people.

There was a very small amount of resistance against this ship originally because it was believed that Shidou was seventeen while Sae was eighteen and therefore Sae was an adult, although in the official character book "Blue Lock Egoist Bible" it was later revealed that both characters are in fact 18, and in their third years of high-school.

Fandom
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Trivia

 * Both Shidou and Sae are 18 and third years in high school.
 * They have a 5cm height difference: Sae is 180cm (5'10) and Shidou is 185cm (6'0).