My daughter Miwa had been living in an apartment after her marriage, but I decided to remodel the house into a two-generation home so she could live with us. Having my precious daughter nearby is filial piety in itself. My son-in-law Shinji is a sincere young man, and my wife Megumi also took a liking to him. However, I never imagined such a humiliating thing would happen... It seems Megumi had been peeking at her daughter's married life and getting aroused. Shinji seemed to have noticed this too. And then, Megumi started going to her daughter's place unnaturally often, telling lies that she knew were transparent. I felt something was off, so I followed my wife...