But one night, he casually sees a portal to hell open up in his local laundromat and is approached by a demon (voiced by Richard Kind), who says he’s there to take Dunn’s kind neighbor (Keith ...

That is why the Demon Slayer Corps had a strategy that could decrease his strength and the Anti-Kibutsuji Drug made by Tamayo and Shinobu began to work. This caused aging in his body of over 9000 ...

Tamayo and Shinobu had created a drug that would systematically slow Muzan down, so what role did they play, and what did they have to set aside to work together on this project in Demon Slayer ...