Eight years after returning to his hometown, Noboru found himself captivated by his aunt Shihori, who remained as beautiful as ever. His days spent with her, the woman he'd always admired, were filled with happiness. However, one night, Noboru witnessed his aunt being pleasured by another man. In that moment, he despised himself for standing by helplessly, unable to do anything. Sensing his inner turmoil, his aunt gently smiled and whispered, "Just tonight, our secret promise," before kissing him. That single moment left a deep, overwhelming surge of emotion within Noboru's heart.