Full Metal Panic!

is an ongoing series of light novels written by Shoji Gatoh and illustrated by Shiki Douji.

Individual chapters are published on Monthly Dragon Magazine, followed by a paperback compilation released by Fujimi Shobo's Fujimi Fantasia Bunko. The novels are split between stories focusing on Sousuke's mission as a soldier of Mithril and comedic side stories centered on his life at Jindai High School.

The series has been adapted into different media; including three animated television series: Full Metal Panic! by Gonzo in 2002, Full Metal Panic? Fumoffu and Full Metal Panic! The Second Raid by Kyoto Animation in 2003 and 2005 respectively. An OVA was also released in 2006; and five different manga series.

Tokyopop licensed the novels for English-language publication in North America and released parts of the series, while ADV Films licensed and dubbed the first season and the spinoff, and released them in North America and the United Kingdom. The second season was licensed by Kadokawa Pictures USA and FUNimation Entertainment with ADV Films producing the dub yet again. Mandalay Pictures acquired the film rights to the series in 2009. At Anime USA 2009, FUNimation announced that it had acquired the rights to the first and second series of Full Metal Panic! and both would be re-released remastered on DVD and Blu-ray in 2010. The series began airing in North American on November 22, 2010, on the FUNimation Channel. The Fumoffu series made its North American television debut on the FUNimation Channel on November 15, 2010.

Plot
The series follows Sousuke Sagara, a member of a covert anti-terrorist private military organization known as Mithril, tasked with protecting Kaname Chidori, a spirited Japanese high school girl. He moves to Japan to study at Chidori's school, Jindai High School, with assistance from his comrades Kurz Weber and Melissa Mao. Having never experienced social interactions, Sousuke is found as a military maniac by his schoolmates as he interprets everyday situations from a combat perspective. He comes to relate with Chidori who realizes that Sousuke is protecting her, but he does not reveal the reasons due to orders as well as the fact he does not know why Chidori is being targeted by different organizations.

Other Sources

 * FMP Wikipedia article