Bossa, attending an all-boys school, is growing increasingly frustrated with a recently created game in his class. The objective is simple: whoever can make the other person erect wins. Although they started playing for amusement, Bossa now sees it as a fierce competition between his classmates. As he naturally maintains his distance and finds the game repulsive, he has never participated and has remained undefeated.
In contrast, Bossa's easy-going classmate Akiyama persistently tries to provoke a reaction from him. Despite being oblivious to Akiyama's motives, Bossa leaves him alone as long as he doesn't overstep any boundaries.