Mizushima and Mihara's mother-in-law had been at odds for a long time, because she didn't want her husband to be sad, so Mizu asked her biological mother to come to Mihara's house to find a reason to stay here so that she could find a way to reconcile with her mother-in-law. Mizu didn't expect Mihara to be a lesbian, her daughter-in-law was constantly controlled and sexually assaulted by her mother-in-law, afraid that if she ran away now, this relationship would become more complicated, so Mizu tried to be patient and let it pass.
The days with her mother-in-law were extremely difficult, Mizu was not scolded, but she was annoyed because Mihara always wanted to touch her body, and then after the last sexual intercourse that day, her daughter-in-law's efforts paid off. Mizu had made her mother-in-law look at her with better eyes, but perhaps she would never forget this incident and she would definitely say no to her husband how she reconciled this relationship.