The story begins when high school student Kazuki Muto is killed one night saving a mysterious girl from a monster, only to wake up in his school dorm, believing it to have been a dream; however, he soon finds out that dream wasn't a dream at all when a giant serpentine monster attacks him and his sister. Tokiko Tsumura, the girl he saved, explains that the monster is a homunculus. Kazuki had been attacked and killed by it when he was rescuing her; however, she, feeling responsible for him, revived him by placing a Kakugane medallion in his chest, serving as a replacement heart.
The Kakugane, as Tokiko explains, is an alchemical device that, when activated, takes a certain form based on the Kakugane's user, forming a unique Buso Renkin. The Buso Renkin is the only thing that can destroy a homunculus monster. Using this, Kazuki creates his own Buso Renkin (the "Sunlight Heart," a huge lance). Along with Tokiko and her own Buso Renkin (the "Valkyrie Skirt," an execution scythe), Kazuki joins the fight against the homunculi and their master.+ More
Characters & Voice Actors

Chouno, Koushaku
Main
Spencer, Spike
English
Muto, Kazuki
Main
Fukuyama, Jun
Japanese
Sakimori, Mamoru
Main
Ebara, Masashi
Japanese
Tsumura, Tokiko
Main
Yuzuki, Ryouka
Japanese
Victor
Main
Koyama, Rikiya
Japanese
Busujima, Hanaka
Supporting
Yahagi, Sayuri
JapaneseRecommended for you
Prism Ark Specials
Special
4m
Aim for the Top! Science Lesson
Special
2m
Yumeria
TV
24m
Arion
Movie
119m
Getter Robo Go
TV
24m
Great Mazinger tai Getter Robo
Movie
30m
Kagaku Ninja-tai Gatchaman (Movie)
Movie
111m
How to Steal 55 Kisses
ONA
11m
Mini Toji
TV
5m
Aratanari Fukaki Ao
ONA
40m
Bakuon! Clubhouse
Special
2m
Dragon Age: Dawn of the Seeker
Movie
89m