Within the safety of the walls, youths are raised in a nursery-style setting by robots. While life there may appear stale on the surface, the children are full of potential and curiosity. In many ways it is like a slice of heaven. The outside world is a hell-scape. It is almost entirely void of anything mechanical and is now inhabited by bizarre, yet powerful super-natural beings.

Maru, with the aid of Kiruko, is out there crisscrossing what was once Tokyo for heaven. But after searching for so long, maybe heaven is more of an untenable dream than a potential reality.

Tengoku Daimakyou ranked first in the 2019 Kono Manga ga Sugoi! for the Male Readers division. The series has been published in English as Heavenly Delusion by Denpa since December 31, 2019. The series has also been simulpub through K Manga. It has also been released in Polish by Waneko since March 9, 2024.