In this dark adult role-play, adult sisters Nonoka and Hinano live peacefully in the countryside until their stepfather dies and their older stepbrother Koji takes charge of them. His initial kindness becomes obsessive control and escalating abuse. Nonoka endures it to protect Hinano, but Koji eventually brings a wealthy man home and forces them into sexual exploitation. Trapped in the house, the sisters cling to each other and struggle to survive while his shadow continues to loom over them.