It locks two doors on you at once. Outside the Tokyu Kabukicho Tower, the dead own Shinjuku. Inside, one of the six girls who took Mikoto Amano in has already killed the other man they rescued, and there is nowhere to run him down to. The amnesia is the cruelest part of the setup: Mikoto cannot rule anyone out, cannot even rule himself out, and every kindness the girls show him reads as either shelter or setup. Six episodes means no filler, no cozy sidebars, just a sealed building shrinking around a group that started to feel like a family before the body dropped. Real horror here is not the zombie pandemic, it is watching people you have begun to trust hold a door and wondering which way it opens.

Civilization crumbles under a zombie plague, leaving survivors to fend for themselves in the wreckage. Mikoto Amano regains consciousness in an unknown location with a blank slate for a past, rescued by six girls who share the safety of Tokyu Kabukicho Tower. The fragile sanctuary shatters when a man brought inside alongside Mikoto turns up dead. The killer is someone within the group, and anyone could be next. With the high-rise now sealed off, Mikoto and her companions Ranna, Lili, Yuu, Fumika, Murumuru and Rumina face one secret after another. Their growing friendship is put to the test as they try to find out who is behind the killing in this six-episode horror mystery.