Hi, it’s Junko from Japan. The original Japanese title for Demon Slayer is KIMETSU NO YAIBA. Here’s the writing for Kanji letters.
KI = Oni, demon
METSU = annihilate, destroy, eliminate
NO = of
YAIBA = blade, sword
If literally translated, Kimetsu no Yaiba means “Blade of Destroying Demon” in English.
The word KIMETSU is a coined word by the author Gotouge Koyoharu. According to him, there was another candidate name for the manga, and it was KISATSU NO YAIBA.
SATSU represents “kill” in Japanese. Since the word was too direct and way too violent, it wasn’t applied and the title with KIMETSU was chosen. But the word KISATSU remains in the work as a name of KISATSUTAI (Demon Slayer Corps).
What’s the difference between SATSU and METSU? They have very similar meanings.
METSU means to destroy and eliminate something. Not only defeat it, but there’s a nuance that trying to wipe out something completely out of this world. I thinks it deserves the determine to extinguish all the demons. Also, it’s not common Kanji symbol in our daily life. So it has a bit classical impression.
You can see the METSU symbol on the back of the Demon Slayer Corps’ uniform too. Check out the link below if you’re interested in more information about this symbol!