Recently, Noboru has been going to his girlfriend's house on dates to have fun at home. He says it's to increase the amount of time they spend together, but in reality, he just wants to meet her mother, Sumire. A mature body, a sexy voice, seductive mannerisms... Every time he visits her house, his feelings for Sumire grow stronger. Then, by chance, he ends up alone with Sumire. As if she could see through Noboru's excited Kokoro, Sumire smiles gently, takes his hand, and kisses him softly. Sumire feels the same way...