Rin, a reserved and uneasy university student, is grappling with the disappointing state of her living quarters. Her apartment, which falls short of its advertised description, is situated in a dilapidated complex filled with dark corners that harbor nefarious characters. The already distressing situation is exacerbated by the occurrence of atrocious crimes in close proximity, alongside the sudden appearance of a disconcerting stranger. Adding to her predicament, Rin uncovers the presence of an ominous power that conjoins mythological legend with monstrous entities and medical science. In search of answers, she consults the library and meets an empathetic young staff member. Regrettably, her findings only serve to heighten her apprehensions and fail to alleviate her anxiety.