two father-in-law and wife

Tragedy 8 years ago. At the age of 18, Yuki loses her virginity to Kentaro, her mother's new partner. Since that day, Yuki's relationship with her "father-in-law" has continued, and she has become a sex toy without being able to talk to anyone about it. Spring comes to Yuki's life. Marriage with the man you love. Yuki was supposed to have a little happiness, but... However, a few months later, Yuki's husband's father, Ryozo, finds out about her relationship with Kentaro. On this day, the gruesome training of the two "stepfathers" who are not related by blood begins...