Shishunki na Omaera no Muda na Doryoku

Bossa goes to an all-boys school, and like that in itself isn't the worst possible scenario for an adolescent boy, his classmates have recently started playing a game where the objective is to make the opponent aroused before they can do the same to you. Bossa finds it all disgusting and pathetic, but his self-proclaimed best friend Akiyama is determined to "defeat" him.