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, little devil hunter, 
these guys are dumb as hell.
يا صائد الشّياطين الصّغير، هؤلاء الأشخاص
حمقى بكُل ما تحمله الكلمة من معنى
Weißt du, kleiner Teufelsjäger,
Escucha, chico devil hunter…
Mira, muchachito devil hunter, estos
tíos son más tontos que las piedras.
Ils sont un peu demeurés,
ces mafieux, t’es pas d’accord ?
Caro Devil Hunter.
Ei, caçadorzinho,
esses caras são burros demais.
Послушай меня, охотничек,
эти мужики реально все тупые.
พ่อหนุ่มนักล่าปิศาจ