My only daughter, Ichika, whom I have lovingly raised, has finally gotten married. Being a doting parent, I couldn't bear the pain of seeing my daughter leave, so I took the plunge and remodeled our home into a two-generation home. My daughter and her husband were happy, so I was optimistic about our future life together, but... Shortly after we started living together as a two-generation home, my wife, Maki, started acting strangely strange. She would visit our daughter's house at every opportunity, leave the house for strange reasons, and even tell obvious lies to meet up with my son-in-law, Shinji...