Riku and his brother Hiroshi are torn from their family and forced into the Legion-a brutal organization shaping children into weapons. Alongside Mei, their fearless friend, they're bound by a loyalty forged through relentless training and harrowing battles. Together, they harness powers that make them dangerous, yet each victory chips away at their humanity. As Riku is forced to confront unimaginable loss and wrestle with his darkest fears, he must decide if freedom is worth the cost.