The secret and legend of the birth of Yukika Osawa (lewd wife) who lives while repeating unfaithfulness and destroying everything even though she knows that it is not ethical! !15 years before her, when her mother was hospitalized for childbirth, her sailor suit was taken off by her lustful father and she lost her worst virginity.She devotes herself to her homeroom teacher, who was her first love, but in the end she runs away and loses her hope of living happily ever after.And Yukika, who turned 18, takes the life-threatening risk of getting hurt and faces an irregular deathmatch between one woman and three men!