A lewd beauty who goes around without a bra or panties moves into the room next to the single Shinichi! Her name is Mona, and she moved in as a married couple. Curious to see what Mona is up to, he jumps over the balcony to peek in and sees her indulging in masturbation! Shinichi's peeping behavior escalates as he sees his neighbor, who is a married woman but dressed in a lewd manner, and is full of sexual frustration and lewdness...