Toru Makoto, a beautiful pianist sister who is famous in the neighborhood. In order to aim for the same path as her longing sister, she worked hard at piano lessons at her home every day. A middle-aged neighbor who is a shut-in NEET feels relentless resentment at the sound of the piano, and finally yells at the house where the sisters live. One day, her sister is brought into a man's house and gets fucked. And her evil hand gradually extends to her older sister.
