Oh I don't mind at all n__n
here is a summary of the first manga, I hope it's good enough.
Shuji and Chise are high school seniors in a small town. They have just started dating thanks to the matchmaking of their mutual friend, Akemi. Meanwhile, the city of Sapporo is attacked from the air. However, a counterattack by Japan's Self Defense Forces (SDF) saves the city from total destruction.
Soon after this attack, Shuji discovers that Chise has been engineered by the SDF so that she can transform herself into a powerful weapon when she is summoned on a mission...the ultimate weapon they call her.
so what is a man to do when he finds out his girlfriend is the ultimate weapon?
the manga is a seven volume, depressing to a point where you question life. it's a wonderful series.