Buso Renkin
Buso Renkin (武装錬金, Busō Renkin?, literally "Arms Alchemy") is a manga series written and drawn by Nobuhiro Watsuki, the creator of Rurouni Kenshin.
The story begins when high school student Kazuki Muto (武藤カズキ, Mutō Kazuki?) is killed one night saving a mysterious girl from a monster, only to wake up and find it was only a dream. However, he soon finds out how real that dream was when a giant serpentine monster attacks him and his sister. Tokiko Tsumura (津村斗貴子, Tsumura Tokiko?), the girl from his dream, explains that the monster is a homunculus. Kazuki had been attacked and killed by it when rescuing Tokiko, however the girl revived him by placing a kakugane medal in his chest.
The kakugane, Tokiko explains, is an alchemical device that when activated can give him the power to fight the homunculus monster. Using this, Kazuki creates his own buso renkin, an alchemical weapon in the form of a huge lance. Along with Tokiko and her own buso renkin, Kazuki joins the fight against the homunculus and their master.
Source:Wikipedia
