Furuya Hiro, Akechi Kei, and Nishino Tomoki's classmate and friend. Member of the baseball team. He has a little sister, and since both of his parents work, Yuusei is in charge of taking care of her. However, since he is a pervert, he plans on raising her to be his ideal girlfriend. In Hiro's eyes, Yuusei is a lolicon. Yuusei prefers girls with a large chest, but seems to harbor feelings for Alice.