Sister’s Fall to Pleasure – Forced by Her Brother

Synopsis

An older brother who dotes on his younger sister Yuka overhears her phone conversation one day. He listens as she talks cheerfully with what seems to be a classmate about their future plans and the possibility of attending the same school. From their conversation, he learns that his sister has a boyfriend, and devastated by this revelation, he becomes convinced that the boyfriend is responsible for her recent coldness toward him.

Blaming the boyfriend for damaging their sibling bond, the brother decides to forcibly isolate his sister by confining her at home, intending to keep her away from this “bad influence.” Taking advantage of summer break when only the two of them are home, he begins an all-or-nothing conditioning program to make his sister entirely his and rebuild their relationship on his terms.