Chainsaw Man: The Hero of Earth

"I don't know if this was a blessing or a curse, but since I was born, doctors said I was strong for a newborn and when I started growing up everyone said I was strong when I took part in a fight. I never understood why I was born so strong, but when I killed a demon for the first time, something changed. Maybe I realized why I was born into this world with this strength. My reason for living. And it's like my master taught me: 'You can't have sanity to hunt demons, you have to be crazy to hunt them'. I think I fit into that category."

Y/n L/n is the son of a family of mercenaries who are responsible for hunting demons across the planet, but after an attack carried out by a demon, where Y/n was the only survivor, his mother decides to send him to the Japan to work with an old friend of hers and thus improve his hunting skills. After a few years, Y/n continues working as a devil hunter for Public Safety of Japan, killing demons and living a good life, but this routine would change when a 15-year-old boy emerges with the power to transform into a demon with chainsaw head. To hunt demons, you need to be crazy and cold to kill, but will Y/n be able to handle it?