One day, Honoka-sensei, the private tutor for Shota's younger brother, arrives at Shota's house. The moment she appears, Shota freezes in shock—because Honoka-sensei possesses an incredible pair of massive breasts. Completely captivated by her huge tits, Shota gradually develops a mischievous urge to get closer to her chest, devising various ways to sneak a touch or a peek. What begins as innocent curiosity soon takes on an erotic tone, and the tension between them continues to build.