Aya, his mother's best friend, who Kentaro became close with at a restaurant they frequent, comes to visit. Kentaro had never been the least bit interested in his mother's friends, thinking they were no good anyway, but when she showed up, he fell in love at first sight with her beauty. Kentaro ends up talking to Aya in place of his mother, who is preparing to host a party at home. Extremely nervous, Kentaro can't help but fantasize about naughty things as he looks at Aya's smiling face...