Like many shounen anime, Demon Slayer – Kimetsu no Yaiba has plenty of moments that leave fans scratching their heads. The series relies heavily on spectacular battles to keep viewers hooked, which means the story and world-building aren’t always as flawless as fans might expect.
Here are some aspects of Kimetsu no Yaiba that challenge fans’ suspension of disbelief.
Simple Breathing Techniques with Extraordinary Power
The logic behind the Breathing Styles in Demon Slayer can be hard to grasp. Somehow, controlling one’s breath can turn ordinary attacks into overwhelmingly powerful strikes, strong enough to overcome seemingly invincible abilities.
Some Breathing Styles even grant supernatural powers, like the ultimate form of the Flower Breathing style, Scarlet Spider Lily. These techniques often feel like flashy additions meant to make the Demon Slayers’ attacks more visually impressive.
Tanjiro’s Prophetic Nose
One of Tanjiro’s strangest abilities is his incredible sense of smell. Having a keen nose is one thing, but Tanjiro can use it to locate lost allies and detect demons’ presence, which stretches believability.
Fans often point out that Tanjiro’s weirdest power is his ability to “smell the future.” He developed this skill during his training at the Swordsmith Village. While this foresight is useful in battle, the idea of “smelling” the future is completely illogical, no matter how fans try to rationalize it.
Kagaya Let His Wife and Daughter Die in an Explosion to Kill Muzan
Kagaya Ubuyashiki, leader of the Demon Slayer Corps, deeply hates Muzan because his entire family suffers from the curse Muzan placed on them, causing short lifespans and illnesses.
In an attempt to kill Muzan, Kagaya lured him to his home, which was rigged with powerful bombs capable of killing weaker villains. What fans struggle to understand is why Kagaya didn’t save his wife and daughter from the explosion. They didn’t have to die as part of his revenge plan.
Tamayo Never Tested Her Cure on Genya
Tamayo is one of the few demons with a conscience, tirelessly searching for a cure to turn demons back into humans. It’s a noble goal, but there’s a character who could have helped her achieve it, yet they never crossed paths.
Genya doesn’t have any Breathing Style powers, but he has a unique ability: eating demon flesh to enter a half-demon state and boost his strength. Tamayo, who is seeking a cure for demons, should have studied Genya’s blood. However, no one in the story ever considers bringing these two characters together to pursue this shared goal.
Tanjiro’s Unrealistic Power Boost in a Short Time
While it’s natural for a shounen hero to grow stronger over their journey, Tanjiro’s power skyrocketing so quickly throughout the series can be hard to accept. His transformation from a weak boy to a powerful Demon Slayer happens almost overnight.
Without even using breathing techniques, Tanjiro manages to defeat a former Lower Moon demon. His strength further surges thanks to the Sun Breathing and Demon Slayer Mark. Although he remains unaware of these powers for a long time, once he taps into them, he becomes strong enough to fight on par with a Hashira.
Inosuke’s Sword Never Breaks Despite Rough Treatment
Inosuke is one of the most reckless characters in the series, known for misnaming others and hiding his handsome face behind a boar mask. He wields twin swords with serrated edges, which many assume are their original design.
However, when his swords were repaired, it was revealed that Inosuke himself chipped the blades by striking them against hard surfaces to create the serrated look. This action should have weakened the swords, making them a liability in battle.
Zenitsu’s Impossible Reflexes
Zenitsu is a fascinating character, but the fact that he only becomes powerful when unconscious is hard to accept. Demon slaying demands intense focus every moment, so it’s illogical that a demon hunter would be stronger while unconscious.
In this state, all his senses heighten, allowing him to use the First Form of Thunder Breathing to defeat powerful demons. This detail shows how beloved Zenitsu is, as fans are willing to overlook the absurdity and accept that his natural reflexes are incredibly strong.
No One Wears Armor When Fighting Demons
The terrifying threat of demons is a constant theme throughout the series. Their brutal strength and Blood Demon Arts can easily wipe out large populations.
Another puzzling detail is that none of the Demon Slayers wear armor in battle. Despite being well aware of the demons’ deadly power, sharp claws, and powerful attacks, they have no protective gear. While armor might limit agility, it would certainly help them survive lethal blows.