One year had passed since the death of her only son, Takashi, and on the day of his memorial, mother Yumi finally resolved to clean his room. She had always been unable to bring herself to enter, but on this special day, she gathered her courage and stepped inside—only to be met with an unexpected sight. Erotic books and DVDs were scattered everywhere, stirring deep emotions within her. Confused yet overwhelmed by an uncontrollable lust, she began to lose herself in lewd thoughts. Suddenly, she felt as if someone was watching her. In that instant, her body froze, unable to move. Could it be sleep paralysis? Or was there a real presence lurking in the shadows? Amidst the eerie atmosphere, Yumi's mind trembled with uncertainty.