No doubt Koyoharu Gotōge’s dark fantasy adventure series Demon Slayer: Kimetsu no Yaiba has become a smash hit. The series has overtaken Bleach in sales by the 17th volume, selling more than 20 million copies by November. Bleach achieved 18 million copies its 17th volume in 2005. Naruto had sold 24 million copies in 2003 …