Zenitsu Agatsuma’s famous quote: Words that resonate in the heart, becoming stronger while accepting one’s weakness.
Zenitsu Agatsuma, a character from the hugely popular series Demon Slayer: Kimetsu no Yaiba.
When he’s feeling energetic, he keeps saying pitiful things, but in battle scenes he transforms and shows a cool side—his unique personality captivates many fans.
Though usually timid, his words brim with a quiet inner strength that surfaces when it truly matters, striking a chord in our hearts.
In this article, we’ve carefully selected Zenitsu Agatsuma’s most moving quotes from both the original manga and the anime.
Zenitsu Agatsuma’s Famous Quotes: Words that resonate with a heart that grows stronger while accepting weakness (1–10)
Sorry, bro.
The person Zenitsu said this line to was not his blood-related older brother, but Kaigaku, his senior disciple who trained under the same master.
Zenitsu and Kaigaku had never gotten along and disliked each other, but deep down Zenitsu respected Kaigaku for his diligence.
However, Kaigaku later chose to become a demon, and they met again in the Infinity Castle, where they fought.
When Zenitsu was finally about to deliver the finishing blow to Kaigaku, he said “I’m sorry,” not only out of the respect he had always felt, but also for failing to build a better relationship with him.
It seems you’re quite pleased that you managed to join the Lower Ranks with some hasty fill-in.
In the Infinity Castle, when he reunites with his senior disciple Kaigaku, Kaigaku hurls one disparaging remark after another at Zenitsu.
Zenitsu, however, ignores the provocations completely and, barely containing his anger, declares this line.
It’s no wonder: their shared master had taken his own life because Kaigaku became a demon, and Zenitsu had sworn to himself that he would defeat Kaigaku no matter what.
It’s one of the rare scenes where the usually easygoing, clownish Zenitsu lays his emotions bare.
Now that you’ve become a demon, I no longer consider you my senior disciple.
In the Infinity Castle, Zenitsu confronts his senior disciple, Kaigaku.
Realizing he could never defeat the Upper Rank One, Kokushibo, Kaigaku chose to become a demon to survive.
Zenitsu, knowing that their master Kuwajima had taken his own life because Kaigaku became a demon, was filled with fierce anger.
It was then that he spoke these words.
The two had a bad relationship, and Zenitsu didn’t much like Kaigaku.
Even so, he respected him for his diligence and undeniable skill.
In these words, you can feel Zenitsu’s sorrowful yet steely resolve to lay Kaigaku to rest as a demon.
Tanjiro, focus only on staying alive. Can you hear me? You won’t die. You absolutely won’t die.
Tanjiro and his comrades work together to steadily corner Muzan, but just as a perfect chance appears, Tanjiro is struck by a fierce attack from Muzan and is left unable to move from the damage.
As Tanjiro, worried about Inosuke and Zenitsu, struggles to help somehow, Zenitsu says these words to him: forget about the others for now—just think about yourself and keep your life going.
He then adds, “Your family is waiting for you and Nezuko to come home.” These words surely gave Tanjiro great courage.
Even after they’ve cut your neck, don’t give up—go on the attack!
This is a line from Zenitsu during the Entertainment District Arc while Tanjiro and the others are fighting Gyutaro and Daki.
They realize the demons can only be defeated by cutting off both of their heads, so the group splits up to battle them.
However, they don’t actually need to decapitate them at the same time; even if Gyutaro’s head is cut off first, they should keep going and aim for Daki’s head as well—so he says.
In response to this smart idea, Inosuke, clearly surprised, blurts out, “Hey, you’re kind of seriously on point right now!” It was a memorable scene—cool, yet funny enough to make you laugh.
I can’t help but feel sorry for Grandpa, who was never blessed with a successor.
In this line, “Grandpa” refers to the master of Zenitsu and Kaigaku.
Within Thunder Breathing, Zenitsu could use only the First Form, while Kaigaku could use every form except the First.
Their master reportedly said, “The two of you together are my joint successors.” However, Kaigaku resented this and trampled on their master’s feelings in a conversation with Zenitsu.
Enraged, Zenitsu retorted with this line, pointing out that their master ended up with only incompetent disciples like himself and Kaigaku.
It’s a line that offers a small glimpse into Zenitsu’s heart—his deep respect for his master and his lingering guilt over his own inadequacy.
It just made clear what I should do and what I have to do.
During the Pillar Training, a special regimen where Demon Slayer Corps members train under the Hashira, there’s a scene where Zenitsu receives a letter.
The letter says his master took his own life.
The reason was that his senior disciple, Kaigaku, became a demon.
Realizing that his beloved master died because of Kaigaku, Zenitsu swore to do what had to be done—to defeat Kaigaku.
Usually lighthearted and goofy, Zenitsu, in this moment, wore an expression unlike his usual self, taut with anger and sorrow.