In the mid-21st century, Tokyo's mafia can turn into ether-enhanced Demon Lords, and Braves hunt them down. Yashiro, the Grim Reaper, reluctantly takes a new apprentice named Aki Jogamine, a high school girl training to become a Brave. He soon finds himself dragged into one troublesome case after another. The supernatural story of a scumbag master and his self-proclaimed apprentice begins!

In the neon-lit depths of mid-21st century Tokyo, the criminal underworld is dominated by ruthless mafia bosses who transform into superpowered Demon Lords through illegal ether-enhancement surgery and science. ...

To combat this escalating threat, the government heavily sanctions a specialized class of bounty hunters known as Braves. By injecting themselves with the dangerous drug E3, these sanctioned assassins temporarily amplify their own magical abilities to blindly hunt down the transformed syndicates. Among them is Yashiro, an embittered and highly cynical freelance Brave known as the Grim Reaper. He simply prefers a quiet life of cheap beer, pizza, and card games, viewing his lethal profession as absolute scum.

Yashiro's dissolute routine is abruptly shattered when Aki Jogamine, an intensely idealistic high school student training at the local academy, proudly declares herself his official apprentice. Despite his relentless protests, Yashiro is forcefully dragged into her chaotic missions, sparking a violent supernatural buddy-cop journey filled with deadly gang clashes and dark underworld conspiracies. More+