Hinata is an introverted geek who sits next to Mikage, a gal, in class. Hinata realizes that Mikage is a former friend from elementary school, and attempts to rekindle their relationship.

The story takes place during the 2595th year of the Ko (Light) Era. Ko, the country of the rising sun, invaded several countries and war rages. Its territory does not stop growing and in heaven, the battlesh...