Sasamoto Sawa (Aya Ueto), a housewife who is not happy in her married life, has a sorrow in her heart that no one knows. While working in a supermarket, she accidentally met Takigawa Rikako (Michiko Kichise) who had just moved to her home and Kitano Yuichiro (Takumi Saito), a biology teacher at a middle school. Rikako's husband has a decent job and a wealthy family, but this empty woman is addicted to the pleasure brought by incest. Sawa did not agree with Rikako's attitude towards life at first, but under the arrangement of the other party, she got closer and closer to Kitano, who had a good impression. Kitano, who is dull and honest, also has many unhappiness in his life, rebellious and open students, peers who do not take him seriously, and his wife (Ayumu Ito) who is academically brilliant. He unknowingly fell in love with the simple Sawa, and the two crossed the taboo line. On the other hand, Rikako was attracted by Kato Osamu (Ikki Kitamura), who drew illustrations for her husband's magazine. The dangerous emotional game made the daytime beauty fall deeper and deeper...