Shieri and Takahiro are stepmother and stepson. One day, Shieri suddenly appears in Takahiro's life through his father's actions, bringing drastic changes. Shieri is more than just a sexual fantasy for Takahiro—she becomes an emotional anchor. However, his prolonged life of constant masturbation leaves deep psychological scars, eventually pushing him to his breaking point. His inner turmoil and emotional instability add profound depth to the story.