A camping trip takes a turn for the wild when the group discovers a mystery mansion in the woods. Excitement turns to thrills of terror as people begin to disappear. Too late, they realize they are trapped in the clutches of a mysterious woman. Who is that woman and will the group of campers be able to escape the remote mansion?

Wataru is a young man who moves into an apartment next to Tomoka and Fumie Fusono, two voluptuous sisters who used to know him when he was a shy child. Now Wataru is all grown up, and the Fusono sisters are ready to take full advantage of that fact.