The secret and legend of the birth of Osawa Yukika (a lewd wife) who continues to destroy everything by repeatedly committing adultery even though she knows it is unethical! 15 years ago, when her mother was hospitalized for childbirth, her lustful father stripped her sailor uniform and she lost her virginity in the worst way. She gave her body and Kokoro to her first love, her homeroom teacher, but he ended up running away with her and destroying her hopes of living a happy life. Now, at the age of 18, Yukika takes the risk of getting hurt and putting her life on the line in an irregular death match between one woman and three men!