The BEST Episodes of Buso Renkin

Every episode ever - ranked by fan votes!

Last Updated: Aug 1, 2020

Network: TV Tokyo

The story begins when high school student Mutou 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. 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 homunculi. Using this, Kazuki creates his own Arms Alchemy (busou renkin), an alchemic weapon in the form of a huge lance. Along with Tokiko and her own Arms Alchemy (busou renkin), Kazuki joins the fight against the homunculi and their master.

A New Life

#1 - A New Life

Season 1 - Episode 1 - Aired Oct 4, 2006

Ever had a nightmare that felt so real you could have sworn that it wasn’t just a dream? Mutou Kazuki was in that predictament–however! It was not a dream. This “dream” ended up ending his life–but…what? He’s still alive?

star 10.00
27 votes
Directors: Shunji Yoshida
Writers: Akatsuki Yamatoya
The True Form Homunculus

#2 - The True Form Homunculus

Season 1 - Episode 2 - Aired Oct 11, 2006

As Kazuki begins to learn more about his enemy and the source of his power he decides to assist Tokito in the eradication of the Homonculi in his town. As Tokito begins investigating the “haunted factory” of the Homonculi she discovers a very disturbing thing, apparently the Homonculi have been developing a new weapon, a parasite that turns people into man eating monsters.

star 10.00
27 votes
Directors: Shunji Yoshida
Writers: Akatsuki Yamatoya
You've Become A Little Stronger

#3 - You've Become A Little Stronger

Season 1 - Episode 3 - Aired Oct 18, 2006

Muto Kazuki and Tsumura Tokiko are investigating who is behind all the homunculi appearances and hostile acts. Only with two leads: He wears a Papillion Mask and attends Kazuki’s high school. With that in mind, Kazuki and Tokiko do a thorough search of the high school–searching for more leads as to who this mysterious ” Papillion Mask Creator ” is. Time is short because of the Homunculus attached to Tokiko, which threatens to take control and transform her into one of the Homunculi in one week!

star 10.00
27 votes
Directors: Shunji Yoshida
Writers: Akatsuki Yamatoya
Another New Life

#4 - Another New Life

Season 1 - Episode 4 - Aired Oct 25, 2006

After searching hard for the Papillion Mask, they finally found him–although he was definitely not what they were expecting. He supposedly wanted to bargain with Kazuki: the antidote to the Homunculus attached to Tokiko’s body for his Busou Renkin, but Kazuki refused. With a single Kazuki punch, The Papillon Mask was knocked out and brought to be questioned. (The “antidote” was a fake.) As soon as they finished “talking”, the super-powerful Homunculus came to save the Papillion and thus–A NEW BATTLE BEGINS!

star 10.00
27 votes
Directors: Shunji Yoshida
Writers: Akatsuki Yamatoya
To Protect Someone

#5 - To Protect Someone

Season 1 - Episode 5 - Aired Nov 1, 2006

Kazuki and Tokiko retreat to form a plan on how to defeat the eagle Homunculus but not all goes as planned when Tokiko receives possibly critical injuries. Hurt but not out for the count the eagle Homunculus plans to target Tokiko, but Kazuki won't hear of it and they face off in an exciting and explosive duel. Kazuki learns the reason behind this Homunculus's awesome strength is quite similar to the source of his own will to fight. When the battle turns against him and all seems lost Kazuki decides to go for broke and unleash a powerful but dangerous attack. With Tokiko's life on the line will Kazuki succeed in defeating the Homunculus? And even if he does with only one day left can he hope to save Tokiko's life?

star 10.00
27 votes
Directors: Shunji Yoshida
Writers: Akatsuki Yamatoya
The Butterfly of Black Death

#6 - The Butterfly of Black Death

Season 1 - Episode 6 - Aired Nov 8, 2006

Kazuki finds Koushaku in his great-great grandfather's laboratory and attempts to destroy the Homunculus matter. However, due to the interference of Koushaku's younger brother, Koushaku is able to have the Homunculus matter attach to him and is turned into a Homunculus. He then begins to eat everyone in the vicinity until he is killed by Kazuki, who passes out from exhaustion before he is able to deliver the cure to Tokiko. Kazuki awakens to find that Tokiko has been cured and that his buso renkin shall be called Sunlight Heart.

star 10.00
27 votes
Directors: Shunji Yoshida
Writers: Akatsuki Yamatoya
Whether or not You're a Hypocrite

#7 - Whether or not You're a Hypocrite

Season 1 - Episode 7 - Aired Nov 15, 2006

Captain Bravo, a member of the Alchemist Warriors and the one who delivered the cure to Tokiko, offers Kazuki to join their mission on combating against the LXE, a group consisting of Human-type Homunculi based in Kazuki's town. Koushaku, having been resurrected by the LXE's leader who is also his great-great grandfather, Dr. Butterfly, and now calling himself Papillon, seeks Kazuki and declares war on him. Kazuki, Tokiko and Bravo are then attacked by Kinjo, a Homunculus of the LXE, but he is quickly dispatched by Bravo.

star 10.00
27 votes
Directors: Shunji Yoshida
Writers: Akatsuki Yamatoya
A Night in the Dorm

#8 - A Night in the Dorm

Season 1 - Episode 8 - Aired Nov 22, 2006

During the night, Bravo takes Kazuki out to the woods for special training while Tokiko protects the kakugane acquired from the previous battle. Later on, a Homunculus named Jinnai uses a buso renkin and takes control over the students in the dorm, ordering them to take the kakugane from Tokiko. Tokiko is able to avoid her classmates and kill Jinnai, freeing them from his control. Papillon takes the kakugane from the defeated Homunculus, declares that he will defeat Kazuki and then leaves the scene.

star 10.00
27 votes
Directors: Shunji Yoshida
Writers: Akatsuki Yamatoya
The Hayasaka Twins

#9 - The Hayasaka Twins

Season 1 - Episode 9 - Aired Nov 29, 2006

Kazuki and Tokiko befriend the Hayasaka twins, Shusui and Ouka. However, the twins are actually humans working with the LXE ordered to kill the Alchemist warriors at the school. When two LXE Homunculi invade the school, Kazuki and Tokiko intercept the threats, causing the twins to realize who the Alchemist Warriors are and that they must kill their friends.

star 10.00
27 votes
Directors: Shunji Yoshida
Writers: Akatsuki Yamatoya
It Seems We're Well Matched

#10 - It Seems We're Well Matched

Season 1 - Episode 10 - Aired Dec 6, 2006

The four begin to battle and Kazuki eventually inflicts a fatal wound on Shusui. Ouka uses her buso renkin and heals Shusui while at the same time receiving Shusui's wound on her own body. Due to this, Kazuki realizes they are both humans and not Homunculi and questions whether they are the enemy or not. Shusui reveals that they worked under the LXE so that one day the two can become Homunculi and live together for eternity.

star 10.00
27 votes
Directors: Shunji Yoshida
Writers: Akatsuki Yamatoya
'Til Death Do Us Part

#11 - 'Til Death Do Us Part

Season 1 - Episode 11 - Aired Dec 13, 2006

Tokiko proceeds to eliminate the twins but is stopped by Kazuki who argues that they are still human and deserve to live. Shusui inflicts a critical wound on Kazuki while he is distracted. However, Ouka uses her buso renkin and absorbs Kazuki's wound damage claiming that Kazuki is someone they can trust. As Ouka begins to die, Kazuki, Tokiko, and Shusui are able to avert her death with the healing properties of the kakuganes. The next day, Kazuki and Tokiko visit Ouka in the hospital who reveals that her brother had left to train in order to rid himself of LXE's corruption.

star 10.00
27 votes
Directors: Shunji Yoshida
Writers: Akatsuki Yamatoya
Carnival

#12 - Carnival

Season 1 - Episode 12 - Aired Dec 20, 2006

Kazuki, Tokiko, and Bravo infiltrate the LXE's base only to find out Dr. Butterfly and his army of Homunculi are targeting Kazuki's school. While Bravo engages in battle with the Homunculus in the base called Moonface, Kazuki and Tokiko defends the school from Dr. Butterfly and his army.

star 10.00
27 votes
Directors: Shunji Yoshida
Writers: Akatsuki Yamatoya
Signs Of Death

#13 - Signs Of Death

Season 1 - Episode 13 - Aired Dec 27, 2006

After defeating the Homunculi, the flask Dr. Butterfly has with him activates and begins to drain energy from everyone inside the school. Papillon appears with his own buso renkin activated and challenges Dr. Butterfly to a battle, eventually coming out victorious.

star 10.00
27 votes
Directors: Shunji Yoshida
Writers: Akatsuki Yamatoya
Who Are You?

#14 - Who Are You?

Season 1 - Episode 14 - Aired Dec 27, 2006

Before Dr. Butterfly dies, he explains that a man named Victor is inside the flask and that he is a being far superior to humans and Homunculi. Kazuki destroys the flask and engages Victor in battle and is seemingly killed after having his kakugane destroyed. Kazuki regains his kakugane which is revealed to be a black kakugane, causing him to transform into a being like Victor with glowing light green hair, red eyes, and tanned skin.

star 10.00
27 votes
Directors: Shunji Yoshida
Writers: Akatsuki Yamatoya
An Intermediate Existence

#15 - An Intermediate Existence

Season 1 - Episode 15 - Aired Jan 10, 2007

After a short battle, Victor concludes that it would take too much time to defeat Kazuki and leaves the school. After reuniting with Captain Bravo, Papillon leaves to research Victor in order to turn Kazuki back into a human being. The next day, they decide to head to the beach where Tokiko runs into Gouta Nakamura. He tells Tokiko to meet with him at night for important information.

star 10.00
27 votes
Directors: Shunji Yoshida
Writers: Akatsuki Yamatoya
New Strength

#16 - New Strength

Season 1 - Episode 16 - Aired Jan 17, 2007

That night, Gouta calls Tokiko out and tells her that Kazuki will be killed. Captain Bravo tells Kazuki that in six weeks, Kazuki will be passively draining energy from those around him like Victor and that Bravo has been ordered to kill Kazuki before the transformation is complete. In a short battle, Bravo handily defeats Kazuki, and leaves him for dead by throwing his inert body into the ocean.

star 10.00
27 votes
Directors: Shunji Yoshida
Writers: Akatsuki Yamatoya
When Dawn Comes

#17 - When Dawn Comes

Season 1 - Episode 17 - Aired Jan 24, 2007

Tokiko manages to find Kazuki's body in the ocean and is able to revive him. Meanwhile, Gouta learns that a team led out by Alchemist Warrior Chief Sekima Hiwatari is sent to confirm Kazuki's death. Gouta learns they plan to assassinate Tokiko and impedes their mission before escaping and rendezvousing with Kazuki and Tokiko. The three then prepare to travel to the school where Kazuki's kakugane was found in order to find a way to restore his humanity.

star 10.00
27 votes
Directors: Shunji Yoshida
Writers: Akatsuki Yamatoya
The Escape

#18 - The Escape

Season 1 - Episode 18 - Aired Jan 31, 2007

Tokiko explains that a mysterious person gave her Kazuki's kakugane and that person may know how to reverse the black kakugane's effect. Meanwhile, Papillon intercepts the team searching for Kazuki and engages one of its members, Genji Ikusabe in battle. Elsewhere, Shusui is recruited by the Alchemist Warriors for the upcoming battle against Victor. Kazuki's group is ambushed by the team at a graveyard.

star 10.00
27 votes
Directors: Shunji Yoshida
Writers: Akatsuki Yamatoya
As Long As I Can Protect You

#19 - As Long As I Can Protect You

Season 1 - Episode 19 - Aired Feb 7, 2007

Hiwatari's buso renkin separates Kazuki from Tokiko and Gouta. Papillon manages to defeat Ikusabe and learns about Kazuki's whereabouts from him. Tokiko and Gouta are able to defeat the enemy, Shinobu Negoro, and resume searching for Kazuki. Elsewhere, the other group of Alchemist Warriors finds Victor and engages him in battle, only to be easily beaten, though Shusui's abilities save them from certain death.

star 10.00
27 votes
Directors: Shunji Yoshida
Writers: Akatsuki Yamatoya
With Strength And Spirit

#20 - With Strength And Spirit

Season 1 - Episode 20 - Aired Feb 14, 2007

Kazuki runs into Captain Bravo, engages him in battle but is soon overwhelmed. Despite the information Tokiko is able to relay, Bravo tells him that after he kills Kazuki, he will kill himself to repent for his death. Kazuki, enraged that his failure will result in Bravo's death, pierces Bravo's buso renkin and wounds him. Bravo accepts that Kazuki has become strong and allows him to continue his search for a cure. However, they are then interrupted by Hiwatari's appearance.

star 10.00
27 votes
Directors: Shunji Yoshida
Writers: Akatsuki Yamatoya
Gone Into Flame

#21 - Gone Into Flame

Season 1 - Episode 21 - Aired Feb 21, 2007

Hiwatari engages the four in battle and Bravo is critically wounded in the process. Just before Kazuki and Hiwatari finish each other off, the Alchemist General, Shosei Sakaguchi, stops them explaining Kazuki's assassination has been suspended and that the top priority for the Alchemists is the battle against Victor. Shosei then reinstates Tokiko and Gouta as Alchemy Warriors and allows Kazuki to continue his search for a cure.

star 10.00
27 votes
Directors: Shunji Yoshida
Writers: Akatsuki Yamatoya
A Decision Is Required

#22 - A Decision Is Required

Season 1 - Episode 22 - Aired Feb 28, 2007

The Alchemist Warriors find and engage Victor in battle. Meanwhile, Kazuki, Tokiko, Gouta, and Papillon arrive at the school and meet a mysterious figure who introduces herself as Victoria and leads them to her brain in a vat mother, Alexandria, the creator of the black kakugane. Alexandria reveals her creation, a white kakugane, and explains it is able to negate the effects of the black kakugane. However, with only one in existence, Kazuki must decide whether to use it on himself or Victor.

star 10.00
27 votes
Directors: Shunji Yoshida
Writers: Akatsuki Yamatoya
Boy Meets Battle Girl

#23 - Boy Meets Battle Girl

Season 1 - Episode 23 - Aired Mar 7, 2007

Kazuki and Tokiko spend time with their friends at the amusement park. After much thought, Kazuki decides what he will do with the white kakugane. Meanwhile, the battle between the Alchemist Warriors and Victor continues.

star 10.00
27 votes
Directors: Shunji Yoshida
Writers: Akatsuki Yamatoya
When You Die, I'll Die With You

#24 - When You Die, I'll Die With You

Season 1 - Episode 24 - Aired Mar 14, 2007

Kazuki retrieves the white kakugane from Alexandria and proceeds to where the battle between Victor and the Alchemist Warriors is taking place. Using his buso renkin, he forces the white kakugane into Victor; However the white kakugane fails to restore him into a human and merely weakens him. Kazuki then flies to the moon, dragging Victor with him and saves the Earth from Victor's reign.

star 10.00
27 votes
Directors: Shunji Yoshida
Writers: Akatsuki Yamatoya
No One Could Ever Take His Place

#25 - No One Could Ever Take His Place

Season 1 - Episode 25 - Aired Mar 21, 2007

Kazuki had sacrificed himself to save the world and left Tokiko in tears. Life continues–Captain Bravo relays the news of Kazuki to his friends as Tokiko is hospitalized, Chouno is left reminescing in Kazuki’s memory. Tokiko goes through a series of thinking and rethinking (in her own way) and finally comes to a conclusion that the last thing she can do for Kazuki before she leaves is to defeat Chouno in his place. Her friends, Gouta, Hayasaka Oka, Oka’s Busou Renkin: Gozen Angel, and Hayasaka Shuusui goes with her to defeat Papillion/Chouno/butterfly man. Can they manage it? Will Papillion even acknowledge Tokiko as a formidable opponent–one as worthy as Mutou Kazuki?

star 10.00
27 votes
Directors: Shunji Yoshida
Writers: Akatsuki Yamatoya