One night, Kazuki Muto jumps in to try to save what he thinks is a girl in distress from a monster and instead gets impaled through the heart. The girl, Tokiko, is actually an alchemic warrior with a Busou Renkin, name of Valkerie Skirt, with the mission to exterminate Homunculi. She implants the only other successful work of alchemy than the Homunculus, the Kakugane, to take the place of Kazuki's heart. The Kakugane resonates with his fighting spirit and forms a Busou Renkin (in his case a spear) so he can fight the Homunculus monsters who prey on humans. Kazuki joins with Tokiko to battle with the Homunculi and protect his friends and his sister Mahiro.
This series is fast paste with a but load of action in every episode. The 2 main characters are "been done before" types but they are likable and above all else, not annoying. The first 2-3 episodes will get you hooked as the plot line is NOT dragged out like most shows. it's to the point.
The animation is great, however the quality of the uploaded versions is, I would say 480p at best but it gets the job done. Wish HD had been around for this. It's got action, blood, death, and alchemy! Sounds like a win to me! Try it out you won't regret it.