Moko will be living alone in Tokyo for two weeks during her cram school's summer class, and will be visiting the weekly apartment where she will be living. - Although it is temporary, she feels excited about life in Tokyo... However, she feels uneasy when she sees a large amount of garbage scattered next to her room. - In the room next to the apartment, there lived a dirty older brother named Shimonuma who was able to continue masturbating even after he came to orgasm, and did not clean up afterward. - Moko musters up the courage to tell Shimonuma, but...