Miho returns to her husband's home in the countryside. This year was her mother-in-law's first Bon festival at her parents' house. Her father-in-law, whom she was meeting for the first time in a while, looked a little tired and a little lonely. However, he showed his strength to her son and his wife as a single man. Miho's father-in-law's masculinity is different from that of her husband, who is used to the city, and the loneliness he shows over time really touches Miho's heart. One day, her husband suggested setting off fireworks to cheer her up. The father-in-law's father-in-law, who sees himself wearing his dead wife's yukata and setting off fireworks, is so reminiscent of his late wife that he bursts into tears and hugs Miho. The father-in-law runs into sex with Miho because of the unstoppable emotion. However, the sexual act is different from that of her husband, and Miho, who has felt love for her father-in-law's ex-wife, decides to seduce her husband only for one week during this Obon holiday. Even though I feel sad, I can't stop the sex with my girlfriend's father-in-law...
