Declared a witch by Gray, Ray is to be burned at the cross. Slipping in and out of consciousness, she sees someone who looks a lot like Zack, but it couldn't be him...could it? Later, Zack recounts the tale of his blood-soaked childhood...

Ray and Zack have arrived at Floor B3, home to the mad prison guard Cathy and her brand of "punishment". Driven into a corner by her many sadistic traps, will Ray and Zack be able to keep their promise to each other...!?

Longing to be useful to Zack, Ray heads deeper into Floor B2. An intriguing scent fills the air, and before she knows it, Ray finds herself drawn to its source-Father Gray. She needs his help, but before she can receive it, her innermost thoughts are revealed, and her trial begins...

As amnesiac Ray and cutthroat killer Zack try to break out of the basement, they finally arrive at the graveyard that is Floor B4. There, a boy who's become quite taken with Ray has been lying in wait...

When Rachel Gardner wakes up in the basement of an unfamiliar building, she finds herself face-to-face with Zack, a serial killer wrapped from head to toe in bandages. Narrowly escaping his bloody scythe, she makes it to the next floor, where she meets a man named Danny who claims to be her doctor. Rachel breathes a sigh of relief, but she can't help noticing that Danny's got a strange look in his eyes...

Thanks to Ray's breakdown, Zack is now forced to explore Floor B1 by himself. Yet as he continues to search the area, he finds that the many traps it hides seem to bear some connection to Ray...

As the building begins to collapse around them, Ray and Zack face their final trial together. The stage is set for their great escape, and with it, the time to fulfill the vow they made to each other has come. Still, one last obstacle lies in their path...