Classmates Suzu and Aya arrive at a mysterious mansion to investigate some rumors for their school newspaper.
As they investigate, they encounter a girl named Nana, who uses a mysterious power to put them to sleep.
She takes Suzu hostage, and intends to use Aya for an experiment to see if humans can die from pleasure.
Suzu must search the mansion to find her, and escape to safety! Can she do it?