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...
We wanted demonic power...
...احتجنا قوّة شيطانيّة
Was wir wollen,
ist die Macht des Teufels, …
Lo que deseamos
es el poder de los demonios.
Anhelábamos el poder de los demonios…
Nous, on a besoin
du pouvoir de ce démon.
Noi desideriamo i poteri di un Diavolo.
Nós queremos o poder do demônio...
Мы с ребятами возжелали
демоническую силу для себя…