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...
And a kid with a pet devil 
can get the job done?
وهل يستطيع فتى يرافقُه شيطان حيوانيّ
أليف إنجاز العمل؟
¿Alguien con un demonio de mascota
sí podrá desempeñarse como devil hunter?
¿Y un crío con un demonio
por mascota vale para eso?
C’est quand même un comble,
un devil hunter avec un démon.
Ma uno con un Diavolo
 come animale domestico può fare questo lavoro?
E dá certo um moleque que
cria um demônio ser caçador?
Да какой из него охотник,
когда он демона в питомцы взял?