Chuuya is a young, ten years old boy who just managed to runaway from the lab he was experimented in. He doesn't have any friends nor any places to stay. He also doesn't remember much about his past because of the experiment the scientists did to him.

Kid!Chuuya just ranaway from the lab

Chuuya has always wanted to be an alpha, but when others presented, he didn't, which led him to think that he's a beta. Later when he's in college, he suddenly went into heat and presented as an omega.

He and Dazai are childhood friends, although they always argue with each other. The only reason they're friends was because they were neighbors.