In order to escape the excessive interference of her mother (Mana Minamihisamatsu), Sato Suzu (Shirumi Michimoto) went to a property in Tokyo for an internal inspection under the guidance of Kawakami Nobuo (Izumi Chitsuka). Although she was told that the former resident Yamamoto Takao (Iwanaga Hihio) had disappeared due to arrears of rent, Suzu was still attracted by this prime property. When Nobuo suggested that she continue the internal inspection alone, Suzu followed his advice. However, she heard some ominous sound in the room, and was guided to open a door to another world, and was then forcibly pulled in. After waking up, she found herself in a huge abandoned building, and met a man who called himself Yamamoto Takao in confusion. This space is dominated by a monster. It is impossible to escape or die. It is a real hell.