Japan has collapsed after the Great Disaster. Kiruko accepts a request to take a boy named Maru to a place called Heaven. Meanwhile, children live behind the walls of a nursery in luscious green surroundings. After receiving a mysterious message, Tokio begins to doubt the world around him.

Maru and Kiruko find what they believe is the doctor and the Immortal Order. Instead, it is a hostile organization that is strongly opposed to the treatment that the Immortal Order provides.

Maru and Kiruko arrive in a prosperous marketplace. It's the town where the rumored Ministry of Reconstruction runs things. Meanwhile, the academy is suddenly under attack. While trying to take shelter, the children find a hole in the wall.