MAN WITH A MISSION's Jean-Ken Johnny says he read all of 'DEMON SLAYER' before writing "Kizuna no Kiseki"He said he wanted to write about "the whole [philosophy] of what the manga brings" instead of focusing on individual charactersJohnny also admitted he was "very careful" when writing the song, saying, "I could easily imagine that if we wrote a bad song, [fans] would be really pissed off!"Full Interview with Genius Japan: