※NOTE：This article includes spoilers.
This time, I would like to summarize the story “Inside the Heart” depicted in Episode 126 of the manga Demon Slayer.
Contents
The beginning is …
This is the moment when Tanjiro and his friends defeat the demon in exchange for Nezuko’s life (Tanjiro thinks so at this time) when they are fighting the Demon of Upper Rank Four. Tanjiro tried to catch the smell. As a result, he “found” and “in the heart” and found that there was a demon in the heart.
“Transparent World”?
At that time, there was no further talk about this depiction, but there are voices that it may be “Transparent World” that will come out later.
“Transparent World” is
“After learning and absorbing a lot of things, scrape off what you don’t need.”
“Then the inside of my head becomes transparent.”
“When the inside of my head becomes transparent, I start to see’Transparent World'”
Said Tanjiro’s father in episode 151.
At the time of the battle with the Hantengu of Upper rank four, Tanjiro seems to have been quite focused on trying to defeat the half-tengu at the expense of Nezuko. It is possible that he was able to focus on sniffing and close everything else to learn “Transparent World.”
Regarding this, in the battle with the Demon of Upper rank three in the 151st episode of Demon Slayer, he awakens to “Transparent World”, but at that time, “It was the same when the half-tengu was hiding in his heart.” He was talking.
However, at the end, he said, “I don’t know if I saw or smelled it,” and it is not clear whether Tanjiro was able to master “Transparent World” during the fight against Hantengu.
Summary：
In the fight against Hantengu, Tanjiro looked like “Transparent World”, but it is said that it is “Transparent World” or “I don’t know if I sniffed it.”