When Kenta was young, he harbored a faint love for his childhood friend's mother, Chisusa. As he grew up and became a man, these feelings gradually transformed into uncontrollable sexual desires. One day when playing at his childhood friend's house, they found themselves alone together by chance. Unable to hold back any longer, Kenta confessed his true feelings to her. To his surprise, Chisusa responded with unexpected words: "Keep this our little secret between us."