A 16-year-old boy who attends a private academy with his sister. After becoming involved in Tokiko Tsumura's fight and subsequently being killed and revived by a Kakugane (which later turns out to be a dark Kakugane), he is told to simply return to his ordinary life, but instead insists upon assisting Tokiko in her battles. Kazuki is very enthusiastic and friendly, and cares deeply for his friends and sister, Mahiro, tending to put himself in danger or difficulty in order to assist or protect others. Although he has an unusual way of showing it, he does have feelings for Tokiko Tsumura.     ~!The Kakugane Tokiko used to revive Kazuki turned out to be Black Kakugane III, which transformed him into a being just like Victor. He is then pursued by the 'Muto-assassination team', as well as his former commander, Captain Bravo. During his assassination, he was dubbed 'Victor III' by the Alchemy Warriors. In the end, he sacrifices himself when he sends himself and Victor to the moon with Sunlight Heart +. In Buso Renkin Period, however, he returns to Earth successfully with help from Victor's Buso Renkin, Fatal Attraction. As soon as he returned to Earth, he and Papillon settled their scores, with Kazuki claiming victory. After this, he returns to a normal life with Tokiko.!~

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.<br><br>
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.

__Height:__ 173 cm
__Skills & Abilities:__ Kendo

[Profile (Pony Canyon)](https://www.ponycanyon.co.jp/artist/31356600) | [Twitter](https://twitter.com/black_fukuyama)

Fukuyama released his debut music album "Romantic World 31" on his birthday (November 26) in 2009, his second album "Love Letters 2: Paris Romantic" on July 21, 2010, his third album "Fukuyama Jun, Ai wo Utau!" on May 25, 2011, and his fourth album "Love Letter 3 ~Matsuri no Kuni de~" on May 22, 2013. He also appeared in a 2009 romantic comedy movie Fujoshi Kanojo in a cameo role.

**Non-anime roles:**
- [Joker](https://anilist.co/character/121590/Ren-Amamiya) - Persona 5
- Renya Goutou - 13 Sentinels: Aegis Rim
- [Camu](https://anilist.co/character/278324/Camu) - Punishing: Gray Raven
- [Kamui](https://anilist.co/character/259960) - Punishing: Gray Raven
- Vyn Richter - Tears of Themis
- Martin - Rune Factory 5
- Hugo - Zenless Zone Zero
- Logos - Arknights

Buso Renkin is the story of teenager Kazuki Muto, who dies trying to save a girl who was being attacked by an eerie monster. The next morning, however, Kazuki is left wondering whether it was all a dream. Lo and behold, the girl, the monster, and his death are all real! The girl, Tokiko Tsumura, was actually trying to slay the homunculus (a beast that can take the form of humans, but whose main source of food is people), but Kazuki got in her way. To revive Kazuki, Tokiko replaces his heart with a "kakugane," an alchemic device that allows him to summon a lance with which to fight the monsters. It turns out that Tokiko is a member of Renkin Kenshi (Alchemist Soldiers), an organization sworn to protect the world from the diabolical creatures. Soon, Kazuki joins Tokiko in her quest to terminate the sinister being that creates and controls the homunculus.
<br><br>
(Source: Viz Media)