For her best friend Misaki, who is about to get married, Akane 'Yui Hatano' and Yukiko 'Yu Kawakami' prepare a hot spring trip. Upon arriving at the secret hot spring 【Kagojiya】 surrounded by mountains and rivers, the three immediately soak in the bath, and their reunion leads to excessive drinking. The next morning, when the two wake up, Misaki is nowhere to be found, and their bodies are tightly bound with hemp rope… Each of them thought they were happy, but each had their own circumstances. When the terrifying secret of 【Kagojiya】 is revealed…
