In the 6th year of Enga, a scientist invented Myther (ミザー)—a device that allows people to design and optimize their personality, making them the best version of themselves. However, alongside its benefits, a new wave of crime called Myther Crimes (ミザークライム) emerged—cases where people lost control of their altered personalities, leading to dangerous and unpredictable crimes. To combat this threat, the Japanese government established the Special Intelligence Bureau, where Kyō (キョウ) operates as a secret agent. His mission is to hunt down Myther criminals, driven by unwavering loyalty to the government. But as he delves deeper, he uncovers dark secrets behind Myther… If technology can change your personality, are you still truly yourself?