A man walks into an apartment full of monsters and finds out he's the only human left who doesn't know the war already happened. The show moves slow, lets you sit with these creatures as neighbors instead of threats, and builds something stranger than action. A single OVA that trusts you to understand: sometimes the real story starts after the apocalypse ends, in the quiet spaces where gods and devils have to figure out how to live next to each other.
Tamura Fukutaro thinks he's found a cheap place to live. What he gets instead is a front-row seat to a war between worlds. The apartment building called Ashiaraiyashiki isn't ordinary, and neither are its tenants. Gods, devils, and creatures caught between realms share these walls, each carrying their own reasons for being here. When Fukutaro arrives, the delicate balance fractures. A catastrophe from two decades ago, when a summoner tore open the barrier between human and supernatural, left the world forever changed. Now one third of humanity is gone, and the survivors live alongside the beings that invaded their cities and homes. The residents of Ashiaraiyashiki exist in the cracks of this new reality, and Fukutaro's presence pulls them into a conflict that reaches far higher than any apartment building. Gods, devils, and an entity called The Central are all playing a dangerous game. Caught in the middle, Fukutaro must navigate loyalties that don't align neatly and choices that carry weight beyond his comprehension.