Full Metal Panic!

Full Metal Panic! is a series of light novels by Shoji Gatoh and illustrated by Shikidouji that was later adapted into an anime and a manga since 1998. The series is about Kaname Chidori, a high school girl who comes across Sousuke Sagara, a member of the anti-terrorist mercenary group called Mithril, who begins following her around.

(series)      Jindai High