Myther

In the 2nd year of Enka, a scientist invented Myther, a device designed to create an ideal personality. With it, people could become their ideal selves and break away from their weak selves. However, underneath the surface, Myther Crime - a hidden social issue - has emerged, where those who abuse Myther suffer from their minds breaking, before carrying out horrific acts of violence.

Kyou, an agent of the Special Intelligence Agency under direct command of the Japanese authorities, secretly takes on the fight against these crimes. All for the sake of his unwavering loyalty to the government…

(Source: Kodansha, translated)