After my mother passed away, she left me with my stepfather and younger brother. Now a high school student, Ruri lives quietly with them, concealing her true feelings. But ever since her mother's death, she's noticed the family's delicate balance beginning to unravel. Her stepfather rummages through her room, her brother peeks on her in the bath. Gradually, their inhibitions erode, and the family's boundaries crumble step by step. "I've become the family's plaything... Mom, just a little longer until I graduate... I'll endure." This story dives deep into a household descending into madness from the perspectives of the stepfather, the younger brother, and the daughter—Ruri.