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...
Y'know, I heard my mom died from some 
heart disease that made her cough up blood.
سمعتُ أنّ أمّي تُوفّيت من مرض في القلب
حيث كانت تكحّ دماً
Meine Mutter war herzkrank.
Dicen que mi mamá vomitaba sangre y
murió de una enfermedad del corazón.
Me dijeron que mi madre murió porque
tenía el corazón mal y tosía sangre.
Tu sais, ma daronne…
Sai, mia madre
Sabe, parece que minha mãe morreu de uma
doença do coração que a fazia cuspir sangue.
А я про маму говорил?..