[2] It is licensed in North America by Sentai Filmworks[3] and in United Kingdom by Manga UK.

Based on the original novel by Natsuhiko Kyogoku, the story takes place sometime in the future.

A deadly virus that has spread worldwide, has drastically reduced the world's population.

Now, people have to eat synthetic food made out of sunflower seeds and must avoid any physical contact whatsoever.

When a series of brutal murders occur, it is up to them to see the dark secrets hidden in the closed-off world they live in.