After successfully closing a business deal, Ono joins his colleague Natsuki at his home for a drinking party. Watching Natsuki and his busty wife, Ryouko (Reira Natsuki), share an affectionate bond, Ono feels a twinge of envy. As the party reaches its peak, a minor argument breaks out between Ono and Natsuki, causing Natsuki to storm off and pass out drunk. Left alone, an irritated Ono turns his attention toward Ryouko...