Transparent World

The **Transparent World** (透き通る世界, *Sukitōru Sekai*?) is a supernatural ocular ability only accessible to Demon Slayers that have awakened the Demon Slayer Mark.

## Overview

Demon Slayers that have awakened the Demon Slayer Mark can utilize a special form of ocular extrasensory perception that alters their vision, allowing them to perceive other living beings as if they were transparent, only being able to see the inner workings of their bodies. Most notably, users are able to perceive the flow of blood, breathing, muscular contractions and joint movements of the creature they are looking at. Potentially, one can use the Transparent World's power to see inside an enemy's body as a way to predict and evade their opponent's attacks, as well as to find openings for their own strikes. The Transparent World can also be accessed by those that are blind as seen when Gyomei Himejima was not only able to form a clear image of Kokushibo in his head, but also perceive his internal organs after awakening this ability.

Additionally, the user is able to perceive the world around them as if it was in slow-motion, thus dramatically increasing their movement speed and reflexes.

Due to the varying circumstances of their awakening, the specifics of how a user accesses the Transparent World is currently unknown. However, one common theme surrounding the accessing of this ability is that the user must focus on looking at their target.

## Known Usages

### Yoriichi Tsugikuni

As he was born with the Demon Slayer Mark, Yoriichi was constantly accessing the Transparent World ever since he was a child. He first displayed his proficiency in using this ability against his father's subordinate, who was a sword instructor, where child Yoriichi landed four strikes on the swordsman in the blink of an eye, knocking the instructor unconscious and causing swellings the size of fists. After the incident, Michikatsu queried Yoriichi about how he had managed to accomplish such a feat, to which he responded by saying that his opponent's lungs expand right before they strike, and that he must simply observe their bone disposition, muscle contractions and blood flow.

When Yoriichi encountered Muzan Kibutsuji as an adult, the Demon Slayer used the Transparent World to perceive the Demon King's bizarre anatomy and created a new technique to attack and destroy all of his vital organs at once.

### Dumisani Mavundla

Dumisani Mavundla first began experiencing the Transparent World after he awoke the Demon Slayer Mark. He first used it against Yuzuriha Kijin and countered all of the demon's attacks, eventually overpowering her after receiving an awakening in his power after his near-death state. After Yoriichi taught him and Sun Breathers that had the mark how to access it, he became a more adept user of the Transparent World, more adept than even Kokushibo. During his fight against Muzan Kibutsuji and Kokushibo later on, he was able to see and deduce the distance their attacks reach and the time intervals between attacks in order to capitalise on the right moment to take them down with a hybridized Sun and Star Breath attack that took them on simultaneously. Dumisani also uses it to check himself and his friends and family for any ailments and if they are healthy.

### Kokushibo

It is unknown when or how he awakened the Transparent World, but Kokushibo (similar to Yoriichi), is able to access the Transparent World constantly without any drawbacks. During the Infinity Castle Arc, Kokushibo first uses the Transparent World to determine Muichiro's identity as his descendant just by glancing at his organs and muscles. Kokushibo also used the Transparent World to perceive Gyomei's bodily structure, and remarked that it was at its peak.

As he is constantly using the Transparent World, Kokushibo can effectively use it to anticipate his opponent's attacks and strike back when they are open.

### Enjuro Rengoku

After Enjuro had unlocked his Demon Slayer Mark, he later obtained the ability to temporarily access the Transparent World. He used the ability in his battle against Kokushibo.

### Yoshihiro Haryu

Although not known, it is stated that noted that Yoshihiro was a user of the Transparent World.

### Hizashi Origanbu

Although not known, it is stated that noted that Hizashi was a user of the Transparent World.

### Hitotsuyanagi Higashisanjo

Although not known, it is stated that noted that Hitotsuyanagi was a user of the Transparent World. She used it in her battle against Kokushibo.

### Ryuzoji Honganji

Ryuzoji showed half of Yoriichi's skill level in using the Transparent World. He was able deduce Muzan's back and thigh whips as having more reach and later decode to take Muzan as an ever-changing lifeform and  who can be in any direction with his extra reach, enabling Ryuzoji counter and pin Muzan to a location.

### Oimikado Mushanokoji

Although not known, it is stated that noted that Oimikado was a user of the Transparent World.

### Tanjuro Kamado

Tanjuro stated that he learned how to access the Transparent World from the father in the form of perception training, and was able to use it proficiently against a giant bear, chopping the animal twice in the blink of an eye before it could even attack.

### Tanjiro Kamado

After he was enraged by Daki and went on the offensive, Tanjiro briefly used the Transparent World through unknown means when he perceived Daki's interweaving sashes in slow-motion. During a climactic point in the fight against Hantengu, Tanjiro achieved the Transparent World and saw Hantengu's real body inside the heart of Urami. In the midst of battle against Akaza, Tanjiro remembered his father teaching him about how to access the Transparent World. By remembering the perception training he received when he was a child and Tanjuro's words of sealing off his other senses and turning his mind "invisible", Tanjiro accessed it for a brief moment which helped him dodge Akaza's nearly unavoidable attacks. Afterwards, with the help of the Selfless State, Tanjiro blitzes Akaza and slashes off his arm before the Upper Rank can react, then manages to behead him with Hinokami Kagura: Setting Sun Transformation.

During the beginning of his fight against Muzan, Tanjiro was shown accessing the Transparent World and looking at Muzan's vital organs. However, due to the excessive amount of damage from Muzan's poison, he wasn't able to stay in that state for more than what seems to be a few minutes. Even afterwards, Tanjiro attempts to use the Transparent World multiple times, but fails mainly due to lack of oxygen caused by his fatigue.

### Gyomei Himejima

After witnessing Kokushibo's overpowering attacks, Gyomei pushed himself to the limits and started accessing the Transparent World, being able to form a clear image of the Upper Rank and his organs despite being blind. Gyomei started using the Transparent World offensively by throwing his juzu bead the moment he swung his chain, using the Transparent World to counter the Upper Rank's own so that it slipped through his sight. He used this again by swinging his flail and tearing off a chunk of Kokushibo's upper body without the latter noticing.

It is later revealed that Gyomei not only proficiently used the Transparent World to land attacks on the Upper Rank, but also took his eyes into account and manipulated his own blood flow to throw off his senses and disrupt his attacks.

### Muichiro Tokito

After having his arm slashed off by Kokushibo and being injured, Muichiro somehow accessed the Transparent World when he returned to the fray and intuitively used it to land an attack on Kokushibo.

### Obanai Iguro

After being instructed by Gyomei, Obanai briefly accessed the Transparent World by focusing on Muzan's body, thus accurately perceiving the Demon King's organs.