My beloved mother, who remarried and took my younger brother and me with her, passed away.Ruri, a high school student, currently lives in this house with her stepfather and younger brother.He has a quiet personality and doesn't show his true feelings.But ever since her mother passed away, she knew that the balance in this house was beginning to shift.Her father-in-law searches through her daughter Ruri's room, and her younger brother looks into her sister Ruri's bathroom... Eventually, the restraints of her rationality begin to slip away.I'm my family's toy...Mom, I'll do my best until I graduate...A family that starts to go crazy after the mother leaves is revealed from the three perspectives of the father-in-law, younger brother, and daughter Ruri!