Sweet and spoiled tsundere little sister Moha Moha. Though she occasionally treats her older brother with a teasing attitude, it's merely an extension of her playful antics. The brother, who has long been toying with his sister, harbors a secret he could never tell their parents. Every night after their parents fall asleep, he secretly indulges in a dangerous game. Today, with their parents out of the house, the two are finally alone again. There's no need for hiding anymore. Slowly, fully, passionately, and wholeheartedly, the siblings dive into an intensely intimate time together. Morality holds no place between them. As their passions intertwine, they transcend the boundaries of mere brother and sister, crossing into a new realm entirely.