There have been rumors circulating about killings happening in a specific location. Mito finds herself in this same location one night and runs into two suspicious individuals who speak of nighttime demons.
To her surprise, the very next day she discovers that the same two individuals have transferred into her school and class! Now Mito must navigate the dangerous world of shady activities that occur after dark.
Additional one-shots include: "Okotoba desu ga, Oujo-sama" and "Hime no Kotonoha".