Eisen no Lovelock

In a world that found peace after the rise of superheroes, two brothers aspired to become heroes themselves. The older brother, Ao, became a "Hero" tasked with protection, while the younger, Hiiro, was classified as a "Mob" responsible for cleanup. Despite their roles, Hiiro often disregards the division and enters dangerous situations, particularly when their childhood friend Iruka is at risk.