Yoko is an undercover agent who's mission is to infiltrate the underground crime world led by Misaki. In her lonely mission, Yoko eventually comes face to face with the feared criminal monster Shinjo.

Saori is living a strange life together with her ex-husband, Tsuyoshi, whose business failed after divorcing her, and her older sister, Rika, who is planning to study abroad. The hearts of the three, who had been kept in a delicate balance, were swaying indecently with sadness and jealousy...