In short
Zenitsu Agatsuma falls in love with Nezuko the second he sees her, talks of marriage at the first opportunity, and spends the rest of Demon Slayer protecting her, knowing from the start that she is a demon. Nobody takes him seriously for twenty-three volumes. The epilogue proves him right: the two marry, and their great-grandchildren bear the name Agatsuma.
Contents
It is the most mocked relationship in Demon Slayer and one of the few the story carries through to the end. A boy who screams, cries and proposes to every girl he meets ends up marrying the only one who could not answer him.
In between, there are months of missions, a box defended with his body, a trying temperament and an attachment that never weakens. This article goes over the story from start to finish. Our page on Nezuko Kamado and her transformation opens this branch. The brother caught in the middle of it all has his own page, Tanjiro Kamado, the series’ hero.
Nezuko and Zenitsu at a glance
| Profile | Detail |
|---|---|
| Him | Zenitsu Agatsuma, sixteen, Thunder Breathing |
| Her | Nezuko Kamado, demon, a twelve-year-old body |
| Meeting | at the wisteria house, after the Drum House |
| His reaction | love at first sight, then marriage proposals |
| What he knows | that she is a demon, and he protects her anyway |
| His founding act | defending the box before he has even seen Nezuko |
| Obstacle | she does not speak for almost the whole story |
| Imaginary rival | anyone who comes near Nezuko, Tomioka included |
| End | they marry after the war against the demons |
| Descendants | Toko and Yoshiteru Agatsuma, in the epilogue |
The couple works on an openly acknowledged imbalance in Demon Slayer. He talks all the time, she does not talk at all, and the series builds their relationship on gestures rather than exchanges.
The asymmetry also shows in the tone. Zenitsu is comic relief in almost every appearance, and the series uses this tone to establish an attachment it then takes seriously.
The gamble pays off because his actions follow. The boy does more than declare his love: he puts his body between the box and the demons every time the question arises.
He talks, she stays silent
Zenitsu talks non-stop, Nezuko does not speak. Their whole relationship is built on gestures, not on dialogue.
How does he meet her?
The meeting happens in two stages, and the first takes place without her. Zenitsu has only recently been following Tanjiro, hears that a demon is breathing in the crate, and defends it anyway in front of the Drum House, without having seen who is inside.
The door opens that evening, in the wisteria house where the three boys are being treated. Zenitsu discovers a young girl, accuses Tanjiro of having been walking around with her all this time, and goes in a second from fury to love at first sight.
The context makes the scene funnier still. Nezuko says nothing and watches the three boys chase each other around the room, which does not stop Zenitsu from considering the matter settled.
Our article on the Demon Slayer trio and its dynamic tells of the group’s formation at this point in the story.
A door opens, and that is it
Zenitsu discovers Nezuko when she comes out of her box, at the wisteria house. His reaction goes from fury to love at first sight.
Why does he always talk about marriage?
The character proposes to just about every girl he meets in Demon Slayer, and the story gives the reason for this behaviour. Zenitsu lives with the idea that he is going to die on a mission, and refuses to die single.
His past explains the rest. An orphan, deceived by a girl who ran off with his money, he carries a fear of being alone that drives him to seek affection everywhere.
Nezuko nonetheless holds a special place. He brings up marriage with her several times, and asks again if it will be soon on the day he sees her walk in the sun without her muzzle.
Our article on Zenitsu Agatsuma, the sleeping demon slayer details this past and what makes him so hungry for attention.
He refuses to die single
Zenitsu proposes to every girl he meets, because he is convinced he will die soon. With Nezuko, he never lets go of the idea.
The Drum House
So the first serious act comes before love at first sight. In front of the house with the shifting rooms, Zenitsu finds himself alone with the box while Tanjiro faces the demon, and Inosuke, who has sensed the creature, wants to destroy the crate.
The boy refuses to give in. He takes the blows without letting go of the box, gets badly beaten up, and repeats that he will let nobody touch what was entrusted to him.
The detail that matters is that he knows. Zenitsu has understood that the crate contains a demon, and he defends it anyway, against a colleague applying the Corps’ rules, because Tanjiro told him it mattered more than his own life.
The scene defines the character for the rest of Demon Slayer. Our article on Kyogai, the drum demon tells of this fight, and our article on Nezuko’s wooden box details the object he defended.
He knew, and he held on
Zenitsu defends the box knowing it contains a demon. He takes another demon slayer’s blows without letting go of it.
The boy who lay down on the crate has his outfit among the series’ cosplay outfits, in the complete Zenitsu Agatsuma collection.
Zenitsu triangles cosplay
Haori shading from pale yellow to orange, scattered with white triangles, over a black uniform, with belt, gaiters and blond wig.
View the product · €79.90What he hears in the crate
His heightened sense changes how he sees the demon. Zenitsu hears the sound people make, reads their state of mind from it, and can tell a human from a demon by ear.
What he hears in the crate is indeed a demon. What decides him is Tanjiro’s sound, so gentle it makes him want to cry, and he chooses to trust him before anyone explains anything.
The series often uses this device. The group’s three boys perceive the world through three different channels, and each understands part of the situation before the others.
Our article on Tanjiro’s sense of smell and its limits details the equivalent in her brother, and our article on Nezuko Kamado, Tanjiro’s sister goes over what sets her apart from other demons.
He trusts Tanjiro’s sound
Zenitsu hears a demon in the box. He defends it because the boy carrying it has the gentlest sound he has ever heard.
Demon Slayer’s comic register comes back whenever anyone gets near the girl. Zenitsu suspects everyone, including his best friend and her own brother, and lets them know by screaming.
The fits take a recognisable form. Long wails, accusations, abrupt gestures, and a return to calm as quickly as they came, which punctuates almost every arc of Demon Slayer.
The device serves more than laughs. It regularly reminds readers that the boy considers this relationship real, at a time when nothing in the story proves him right.
The gag ends up being vindicated, in fact. The epilogue validates what twenty-three volumes presented as a joke, which is one of the rare times the series makes this choice.
The gag that ends up winning
Zenitsu’s fits of jealousy serve as comic relief throughout the story. The epilogue proves them right.
What Nezuko feels on her side
The difficulty with this relationship comes down to one simple point. Nezuko does not speak for most of Demon Slayer, which makes her point of view hard to establish.
The signs are there, though, and the first is not flattering. The series’ reference material states that she first sees him as a funny dandelion, and she gazes at him with admiration on the evening he defends her on the train, until he starts snoring again.
Her attitude changes after Swordsmith Village. She smiles, repeats the words said to her, and greets Zenitsu with a “welcome back” addressed by mistake to Inosuke, which drives him wild.
Our article on Nezuko and her resistance to the sun explains why she did not speak, and our article on Nezuko’s return among humans tells what follows.
A funny dandelion
The series’ reference material indicates that Nezuko first sees Zenitsu as a funny dandelion. The rest comes with time.
The unwitting rival
The series saves a gag for after the war, and it involves a Hashira. Nezuko mends Giyu Tomioka’s torn haori while he is in a coma, and comes back every day with the repaired garment, calling his name.
The man, grateful, sends her gifts once he wakes up. Kimonos, Western-style clothes, hair ornaments, in such quantity that Zenitsu starts to see him as a serious rival.
The scene closes a loop opened in the first chapter. The Hashira who almost beheaded the demon ends up sending her kimonos, and the boy who had been defending her for months takes offence.
Our article on Tanjiro and Giyu Tomioka tells of this convalescence and what came before it.
A Hashira as a rival
Giyu sends Nezuko so many gifts after the war that Zenitsu takes him for a rival. He had almost killed her two years earlier.
Life together after the war
The four characters settle together at the end of Demon Slayer, in the house on the mountain. Tanjiro, Nezuko, Zenitsu and Inosuke live under the same roof, and the story allows itself a few pages of everyday life.
The boy picks up his old habits. He exaggerates his leg injuries so that Nezuko will massage them out of pity, until Tanjiro takes him seriously to task.
The detail is not gratuitous. The series’ reference material states that Tanjiro warns him a second time: at this rate, Nezuko will end up seeing him as a little brother, and that is what makes him change.
The scene also closes the trio’s story. Our article on what becomes of Tanjiro at the end tells of this recovery period.
Little brother or husband
Zenitsu plays the invalid until Tanjiro takes him to task. He changes so as not to end up a little brother in Nezuko’s eyes.
You will find their everyday life together on the shop’s bedding.
Nezuko and Zenitsu kimono bedding set
The two in chibi style and festive kimonos, Nezuko holding out a mandarin to Zenitsu sitting on cushions.
View the product · from €69.90The marriage and the descendants
The series shows no ceremony, which is its usual method. It shows the result: in the present-day epilogue, an Agatsuma family exists, descended from Zenitsu and Nezuko.
Two names appear clearly. Toko Agatsuma and Yoshiteru Agatsuma are the couple’s great-grandchildren, and they closely resemble their ancestors.
The amusing detail concerns the family heritage. The descendants have kept the memoirs Zenitsu wrote about his life as a demon slayer, seventy-nine volumes in which Nezuko becomes a princess, and which they find greatly exaggerated.
Our article on Zenitsu Agatsuma, the sleeping demon slayer details his path, and our page on the directory of the series’ characters places this generation.
No ceremony, descendants
The series shows no wedding. It shows Toko and Yoshiteru Agatsuma, the couple’s great-grandchildren.
You can also wear the couple on your back, thanks to the shop’s jackets, next to the complete Nezuko Kamado collection.
Nezuko Zenitsu teddy jacket
Pink body with white sleeves, Nezuko in profile and a beaming Zenitsu in a pink frame, two little hearts.
View the product · €79.90The moments he stands his ground
The most fearful character in Demon Slayer stands his ground several times, and above all for the same reason. When Nezuko is in danger, the boy stops running away, which rarely happens to him otherwise.
The clearest case remains the Drum House, but it is not an isolated one. During the train arc, Zenitsu, asleep, slices through the demon’s flesh coiling around Nezuko, tells her he will protect her, and holds her close when the carriages derail.
He also holds firm when she is not at stake. During the Hashira Training, terrified of the Wind Hashira, he still grabs Genya to pull him away from his brother.
The pattern repeats until the end. Facing the first demon, the boy stays focused, strikes without panicking, and the story points out that the old Zenitsu would have frozen on the spot.
He stops running for her
Zenitsu runs from everything, except when Nezuko is in danger. The pattern repeats from the first arc to the final battle.
Why does this couple work?
The success of this relationship rests on a rule Demon Slayer applies everywhere. Declared feelings count for less than repeated gestures, and Zenitsu lines up the gestures from one end of the story to the other.
The character protects the box, puts himself in front of the blows, and steps in without thinking every time the girl is in danger, even when he is shaking with fear.
The contrast with his general behaviour makes these moments readable. A boy who always runs away stands firm when it comes to her, and readers notice it well before the story points it out.
So the epilogue’s marriage does not come out of nowhere. It validates a series of actions taken arc after arc, in a story that kills most of its characters before the end.
Gestures, not declarations
Zenitsu declares his love all the time, which does not count. He puts himself in front of the blows, which does.
One reading of this relationship is still debated by Demon Slayer readers. Zenitsu becomes attached to a girl who does not answer him, whom he barely knows, and the series does not hide how adolescent this fixation is.
Yet the story never treats it as a flaw to be corrected. It lets it be, mocks it regularly, and ends up rewarding it, which is an unusual position for a fighting manga.
The balance point comes after the war. The two live under the same roof for months, Nezuko has regained her speech, and the relationship finally develops both ways before the epilogue.
It is this period the series skips. Between the shared house and the appearance of the great-grandchildren, the story shows nothing, and leaves readers to fill the gap.
