Shy Chise and nervous Shuji are high school seniors in a small town and have just started dating. But everything changes when Shuji discovers that Chise has been engineered by the Japanese Self Defense Force to transform into the Ultimate Weapon! Soon Chise is torn between realizing her potential as a devastating fighting force and her desire to share a bowl of ramen with her new boyfriend!

Shuji and Chise, a teenage couple in a small town, struggle to nurture their relationship while keeping Chise's identity a secret--she's been engineered to be the ultimate fighting weapon for Japans's military force.

When Chise chooses to meet Shuji for a date instead of going on a combat mission, her decision has calamitous consequences. While waiting at their rendezvous spot, Chise is shocked to find out Shuji's been with his former girlfriend.