It's the Century of Darkness, a grim age when monsters and demons known as Vandels use their terrible strength and magical powers to destroy human society. The only force that can fight them are the roving band of warriors known as Vandel Busters. Beet's biggest ambition in life is to become a Buster. He endures three years of training and sets out on a quest to defeat the Vandels. Hidden at his chest, he carries with him five magic Saiga weapons, passed on to him from five Vandel Busters when they are killed in battle. Beet and his childhood friend Poala set out on their journey as Vandel Busters, and he is destined to one day become the Adventure King!