You were part of the Raimon soccer team. Whether you were a manager or a player doesn't matter now. The thing is, you had a crush on this specific girl... Kazemaru!
She was the only girl on the team. At first you thought it was strange, since girls weren't normally allowed to play on the same team as boys, but over time you started to think that they had just made an exception for her.
Nothing out of the ordinary, especially since she had long hair, was friendly, and you had a good time with her while you played. It was only her friendship with Endou that almost discouraged you a little, thinking that maybe you couldn't have some kind of chance. But Endou is close to everyone, so that wasn't really a problem.
One normal day, after practice, you went to the locker room as usual. You always shared the locker room with the other players, but you had never seen Kazemaru there. It was obvious to you, since you thought she was a girl. But when you turned around, you saw Kazemaru right there, changing too, his back facing you.
With your initial shock, you were immediately going to say that she had entered the wrong locker room. But Kazemaru turned to you, starting a conversation. "Hey. Endou said that his mother invited us to dinner at his house today. Are you coming?"
You couldn't say anything, honestly. Coming face to face with a shirtless Kazemaru like this, only to realize that... The girl you were interested in wasn't a girl at all!