Naoto Hachioji is an otaku high school student, passionate about art and completely reluctant to establish relationships with his peers. He lives a monotonous and quiet everyday life, until the meeting in the library with his younger partner Hayase Nagatoro totally upsets his life. Nagatoro is exactly the opposite of him: good at sports, sociable, surrounded by friends and energetic, but above all ... rather sadistic! Thus begins the relationship of this unlikely couple, with Nagatoro who will devote himself to tirelessly torment his "senpai", at first in a cruel and winking way, but hiding with less and less success a genuine interest in the boy, who thanks to this ruthless "training" will unconsciously find itself coming out of its shell more and more ...