Try to Know Everything About Her.
Floor B1 looks like an ordinary residence. After following a trail of blood to what appears to be a living room, Rachel suddenly panics. She pressures Zack to kill her immediately, then passes out. Then Danny appears, only to shut Zack out of the room and tell him, "If you succeed in learning everything, I'll open the door." So Zack sets off to search the floor on his own for the truth...
Aired 21/09/2018EP 12 - Try to Know Everything About Her.

Angels of Death
13-year old Rachel awakens to find herself trapped in the basement of an abandoned building. Without any memories, or even a clue as to where she could be, she wanders the building, lost and dizzy. In her search, she comes across a man covered in bandages. He introduces himself as Zack and he wields a grim-reaper like sickle.
A strange bond is struck between them, strengthened by strange, crazy promises…
These two, trapped in this strange building, don't know why fate has placed them there. But they will work together desperately to find a way out…