The protagonist, a first-year high school student, has a younger sister. Despite her age, she has impressively large breasts, thanks to the protagonist’s unique ability. Using this ability, the protagonist forms physical relationships with his sister’s gyaru-style beautiful friend, a married woman suffering from domestic violence, a stunning classmate, and others.
With each sexual encounter, his ability grows stronger, leading him to sleep with numerous women and ultimately create his own harem.
A sequel, How My Oppai Skill Led to Building a School Harem, is currently being serialized. (T/N: I will do that as well.)
