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...
I can kill you like a devil,
،يمكنني قتلك كشيطان
Willst du als Teufel von mir getötet …
Una, escoger ser un demonio
y que yo te mate.
Ser un demonio y que te mate yo misma,
Je peux te tuer
comme un vulgaire démon,
Ser morto por mim, como um demônio...
либо я убью тебя, демона, сейчас…