A kid inherits five legendary weapons from the heroes he got killed, then spends the whole series trying to become worthy of them. The world runs on RPG logic that actually makes sense in narrative terms, not just as window dressing. Beet earns power by learning what his predecessors died teaching him, one monster hunt at a time.

In a world trapped under the shadow of Vandels, demonic beings that command monsters, one boy carries the weight of a catastrophic mistake. Beet idolized the Zenon Squad, the strongest Vandel Busters on the continent, until an error of his led to their defeat at the hands of the devil Beltose. With their dying breaths, the five warriors poured their life force into their weapons, called Saiga, and entrusted them to Beet. Years later, Beet is a young Vandel Buster himself, and he sets out on an adventure to carry on the squad's legacy and bring the dark century to an end. The story is an adventure fantasy with supernatural elements.