Husband cheats, wife goes back to her hometown to seduce her father-in-law

Rei and Tetsugaku have been married for 5 years. However, recently Rei feels that her husband has been distant with her. Checking her husband's phone, she discovers that he is cheating. In her despair, her father-in-law visits the couple's home.

Since childhood, her father-in-law has always treated Rei very well. Meeting again today, those feelings are stronger than ever. Rei takes the initiative to approach her father-in-law, asking him to help alleviate her loneliness...