A state that guarantees its citizens everlasting happiness? That's what Cherub strives to be. However, its memory alteration procedures used to alter or erase traumatic memories show a much darker site to them. Noriaki, after being pressured into joining an underground rebel group, aids said rebels to uncover the corruption within the state. When is it okay to be selfish in pursuit of happiness? What is left of a human if one gets rid of all bad memories?