Zenitsu Agatsuma
A coward who finds his courage in the face of betrayal.
Zenitsu Agatsuma is a Demon Slayer and one of Tanjiro Kamado's companions. He faces his former senior Kaigaku, who became the new Upper Rank Six after an encounter with Upper Rank One Kokushibo. Angered by Kaigaku's lack of guilt over his betrayal—which led to their master Jigoro committing seppuku—Zenitsu battles him. Kaigaku voices his frustration at being compared to Zenitsu, but is killed when Zenitsu uses a self-taught Thunder Breathing form. After the fight, Zenitsu passes out and momentarily enters the afterlife, where Jigoro reaffirms he has always been proud of him; he is then rescued by a disguised Yushiro, who has been using his Blood Demon Art to help the Ubuyashikis map the Infinity Castle.
- Role
- Demon Slayer
- Breathing Style
- Thunder Breathing (self-taught form)
- Affiliation
- Demon Slayer Corps
- Mentor
- Jigoro Kuwajima
- Status
- Alive
Lore & Background
Zenitsu Agatsuma was a student of Jigoro Kuwajima, the former Thunder Hashira. When his senior Kaigaku betrayed the Demon Slayer Corps and became a demon—ascending to the new Upper Rank Six after an encounter with Kokushibo—Jigoro committed seppuku out of shame. Zenitsu, enraged by Kaigaku's lack of guilt over this, confronted him in the Infinity Castle. During their battle, Kaigaku voiced his frustration at being compared to Zenitsu, but Zenitsu defeated him using a self-taught Thunder Breathing form. After the fight, Zenitsu passed out and momentarily entered the afterlife, where Jigoro reaffirmed that he had always been proud of him. He was then rescued by a disguised Yushiro, who used his Blood Demon Art to help the Ubuyashikis map the Infinity Castle.
In Their Own Story
The Infinity Castle's shifting corridors echoed with the clash of steel. Zenitsu faced Kaigaku, the demon who had once been his senior. "You betrayed our master!" Zenitsu shouted, his voice trembling with fury. Kaigaku sneered, voicing his frustration at always being compared to Zenitsu. But Zenitsu's anger ignited a new power—a self-taught Thunder Breathing form that he unleashed in a blinding flash. The strike severed Kaigaku's head, ending the demon's life. Exhausted, Zenitsu collapsed, his consciousness slipping into the afterlife. There, he saw Jigoro, who smiled and said, "I have always been proud of you." A moment later, Yushiro's Blood Demon Art pulled him back to the living world.
Reader's Guide
Zenitsu Agatsuma is a Demon Slayer who wields Thunder Breathing. His defining moment in the Infinity Castle arc is his battle against Kaigaku, the new Upper Rank Six. Key points from the source: Zenitsu was angered by Kaigaku's betrayal, which led to their master Jigoro committing seppuku. During the fight, Kaigaku voiced frustration at being compared to Zenitsu. Zenitsu defeated Kaigaku using a self-taught Thunder Breathing form. After the battle, Zenitsu passed out and entered the afterlife, where Jigoro reaffirmed his pride in him. He was rescued by Yushiro, who used his Blood Demon Art to help map the Infinity Castle.
Did You Know?
- Zenitsu defeated Kaigaku, the new Upper Rank Six, using a self-taught Thunder Breathing form.
- Kaigaku became Upper Rank Six after an encounter with Upper Rank One Kokushibo.
- Zenitsu's master Jigoro committed seppuku due to Kaigaku's betrayal.
- After his battle, Zenitsu passed out and momentarily entered the afterlife, where Jigoro told him he was proud of him.
- Zenitsu was rescued from the afterlife by a disguised Yushiro using his Blood Demon Art.
Frequently Asked Questions
Who is Zenitsu Agatsuma?
Zenitsu Agatsuma is a central protagonist and Demon Slayer who serves as one of Tanjiro Kamado's most loyal companions. He is defined by his extreme duality, acting as a trembling coward when awake but transforming into a terrifyingly skilled warrior when unconscious.
What are Zenitsu's powers and fighting style?
He specializes in Thunder Breathing, having mastered the First Form to perfection and later creating the unique Seventh Form. While his conscious mind is paralyzed by fear, his subconscious allows him to execute lightning-fast strikes with Hashira-level precision.
How does Zenitsu's story end?
Zenitsu survives the final battle against Muzan Kibutsuji and lives into the Taisho era as a respected former Demon Slayer. He eventually marries Kanae Kocho's sister, Kanae, and raises a family while continuing to train new slayers.
Why is Zenitsu important to the series?
His character arc highlights the theme that true strength often hides beneath insecurity, proving that even those who appear weak can become heroes. His unwavering loyalty to his friends provides crucial emotional support and tactical aid during the Corps' darkest moments.
Who trained Zenitsu in swordsmanship?
Zenitsu was personally mentored by Jigoro Kuwajima, the former Thunder Hashira who also taught Tanjiro's father. Although Kuwajima initially doubted his potential due to Zenitsu's cowardice, he recognized the boy's natural talent for speed and breathing techniques.
More in Characters & Breathing Styles
Elsewhere in the Demon Slayer universe
Spotted an error? Know more?
This is a living reference — every entry is fact-audited, and reader corrections feed straight into our audit queue. Suggest an edit · See this site's audit record