Denji is a teenager who lives his life as a Devil Hunter.

Aiming to pay off the debt he inherited from his father, he starts hunting devils for the yakuza with his buddy Pochita, a "Chainsaw Devil", while living a tragically poor life.

Just when things seem like they couldn't get any worse, Denji gets betrayed and killed by the yakuza. As Denji starts passing out, he hears someone calling from inside his head...
Once you're all dead...
...حالما تموتون جميعاً
Ich muss euch nur alle niedermetzeln,
dann hab ich keine Schulden mehr!
¡Si los mato a todos ustedes, cabrones…!
¡Cuando os haya matado a todos,
Devo ammazzarvi tutti!
Se eu matar todos vocês...
Я ж если вас всех, уродов, порешу…
ขอแค่ฆ่าพวกแกทุกคนให้หมด