Zero-In summary:
Kou Shiraishi was your standard high school boy with lots of problems, mostly bullies, until the day that he meets Mikuru Nazume during a bank heist. Not only is Mikuru the school idol, but she's also an agent for Minkei, a covert paramilitary section of the National Police Agency. They team up as Kou and Mikuru journey to become stronger, both in their own way.