Original work by Fujisaki Rei Female Teacher Sisters

It has been five years since Misao (Kawakami) married Miyuki (Kurata)'s older brother. The step-sisters who taught at the same school were as close as their biological sisters. ...However, the relationship between the two begins to be distorted by the sexual preferences of a student. The student's name is Nishigi Ryo, and he plays a normal, ordinary high school boy. However, when the sadistic desires that have emerged within him go out of control, the daily life of the young female teacher sisters falls into a swamp of carnal desires, which are crazy about lewd jealousy...