A kid's mistake gets his heroes killed, and he inherits their weapons as a funeral gift. That guilt doesn't fade, it fuels every battle, every new ally he collects, every step toward the strength he should have had from the start. Beet carries five dead people's final choice on his back, and the show never lets you pretend that's a clean story about growing stronger.
A dark age grips the world, and monsters rule through the hands of devils called Vandels. Beet is a young boy desperate to become a Vandel Buster, a hunter sworn to eliminate these creatures and free humanity from their grip. When he encounters the legendary Zenon Squad, the strongest busters on the continent, his admiration turns to guilt. A single mistake during their confrontation with the powerful Vandel Beltose costs the entire squad their lives. With their dying breaths, they channel their remaining power into five sacred weapons and entrust them to Beet. Years later, Beet sets out as a fledgling Vandel Buster carrying the weight of their sacrifice. Armed with the legendary Saiga weapons and haunted by his past, he travels across a ravaged continent searching for answers and redemption. Along the way, he gathers unlikely companions and uncovers truths about the Vandels, the source of their power, and whether the dark century can truly be ended. Beet's journey becomes less about personal glory and more about honoring those who fell for him.