Angels of Death, Vol. 1 (Satsuriku no Tenshi, 1)

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...