Amazing training of younger men through SM matching. In a world where matching between sadists and masochists has been institutionalized. Masachika (M), an office worker, is introduced to a younger university student, Seiji (S). He intends to take the lead, but is at the mercy of Seiji's unexpected sadistic techniques and is made to climax violently! Thinking that their bodies are a perfect match, Masachika starts living together with Seiji and plans to train him to his liking. However, he finds himself overwhelmed by the contrast between his kindness and his masculinity as he is aggressively dominated!