One day, a beautiful stranger was cleaning the stairs of my apartment... and she was wearing no bra or panties! Her name was Ai Saotome, and it seems she and her husband had just moved in next door. Before I even had a chance to say hello, one day an envelope addressed to Saotome was mistakenly delivered to my room. Could this be someone's plan? A relationship full of mystery and eroticism has begun with this neighborly wife!