The manga is set in a world where, beginning with vampires, the supernatural world has been exposed to the public. Dorothy, a member of the Red Sisters clergy group that hunts down supernatural beings, has a...

Based on the visual novel Saishuu Chikan Densha 3

Suou is just a normal highschool student. One night, she dreams about a red-haired demon girl... who shows up the next day in the middle of class and "claims" her as her property.