"Rin" encounters a student from the same apartment building on her way back from jogging. The student is awestruck by her stunning beauty. Seeing him like this, "Rin" gets excited and drags him home to perform lewd acts. She turns into a she-beast with his young penis, repeatedly engaging in sexual intercourse. However, the man who has gotten serious demands a divorce from "Rin". The lives of the three, including her husband, go haywire.
