Tokyo's criminal underworld has been employing medical procedures known as ether augmentation to boost their own powers and influence. To counter this threat, bounty hunters called Braves have emerged, using their own ether powers to eliminate the powerful mafiosos known as Dark Lords. Although he is a self-proclaimed first-rate Brave, Yashiro struggles to make ends meet. One day, Yashiro helps out a young student of Shibuya's Brave Academy named Aki Jougamine. Impressed by his skill, Aki begs him to help save her friend and fellow student, Saera Kashiwagi Pendragon, from the clutches of a Dark Lord, which he reluctantly agrees to. After assisting them, Aki, Saera, and their friend Yukine Indou insist on apprenticing with Yashiro. Despite his attempts to dissuade them from the dangers of bounty hunting, the trio believes that Yashiro is their key to becoming full-fledged Braves, leaving him to reluctantly give in. With each new threat they encounter, Yashiro will try to convince them that the three students are not cut out for bounty hunting, but they may just prove him wrong.