One night and two days of 1 night and left alone by my wife's sister who suddenly came over

Apparently my younger sister has been fighting a couple and has returned to her parents' house. Upon hearing the news, Akari (Asagiri Mitsuru) rushes to the house where his stepbrother was left alone. Care for his brother-in-law, who is probably in trouble alone, and arbitrates a fight. When I told her that she was there for this, my brother-in-law happily welcomed Juri into her house. When her younger sister is away, she manages to get in the house and secretly smiles. Tonight I'm alone with my brother-in-law without anyone's intervention. Juri's true goal was the body of her brother-in-law.