Zen Seizaki is a public prosecutor in the newly created Shiniki district west of Tokyo which is a testing ground for a new nation.

During the investigation, Shin Inaba, an anesthetist, is found dead and a bloodstained document is discovered, which includes hair and skin, covered with letter "F".

Seizaki's investigation leads to a plot involving the mayoral elections and manipulation of the Shiniki population to embrace a new legislation legalizing suicide.

Seizaki discovers that a sinister woman named Ai Magase appears to be behind the push to legalize suicide and is causing the deaths of all of those who oppose her.

[1] A manga adaptation with art by Nobuhide Takishita began serialization on Kodansha's Comic Days website on February 25, 2019[8] and ended on October 7, 2019.