On a day off, when Koki had planned to do nothing but laze around at home, Miki, his mother's close friend, suddenly appears before him. Struck by her alluring and seductive beauty, he falls for her instantly, completely captivated. Not only is she exuding charm, but her massive breasts seem ready to burst through her clothes, leaving Koki mesmerized and unable to think straight. Overcome by desire, he peeks at her while she bathes—yet instead of getting angry, she gently guides him, initiating a bold new relationship.