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Kazushi, a college student living alone, was worried about the existence of childhood sisters who entered the apartment. Cheeky older sister Ayane and her own younger sister Kotone. Because they are always there, if you notice it, it will be a semi-compulsive ascetic life … One day, a minor quarrel triggers Kazushi to take a small bath in the apartment with his sister. While wearing a swimsuit, Kazushi’s reason fluctuated with the soft touch that adheres to the body-