My beloved mother, who remarried and took me and my brother with her, passed away. Now, Ruri, a high school student, lives in this house with her stepfather and brother. She has a quiet personality and doesn't show her true feelings. However, she knew that the balance of this house had started to collapse since her mother passed away. Her stepfather rummages through her daughter Ruri's room, and her brother peeks at her older sister Ruri in the bath... before long, the brakes of reason are loosened. I'm the family's toy... Mom, it's just a little longer until I graduate... I'll do my best. The family that started to go crazy after the mother passed away is revealed from the three perspectives of her stepfather, brother, and daughter Ruri!