​Keisuke’s world turns upside down when his father reveals his cancer diagnosis to the family. Determined to take over the family business, he also announces his intention to marry his father’s colleague’s daughter. However, Keisuke’s sister, Misaki, has other plans. In a forbidden twist of fate, the siblings entangle themselves in a passionate affair, exploring desires beyond the bounds of sibling love. As their love intensifies, their tryst takes place on the very day Keisuke’s fiancee’s family is set to meet them. Witness the illicit surrender of Keisuke and Misaki as they indulge in a night of unbridled pleasure, leaving all moral constraints behind.​