Hiro harbored deep feelings for his kind and beautiful mother, but lacked the courage to confess them, leaving him restless and tormented each day. One day, he picked up a book titled "Incest" at his favorite bookstore and secretly immersed himself in its contents within his room. Captivated by the bold scenes depicted in the book, Hiro began indulging in fantasies of being alone with his mother, satisfying his uncontrollable desires through imagination. The story unfolds as Hiro's hidden emotions and impulses intertwine within his inner world.