When Y/N Tsukumo returned to Heartland City after years of searching for his parents, he never expected to be thrown into a world of Barians, Number cards, and a battle for the fate of multiple dimensions. Alongside his younger brother Yuma and the mysterious entity Astral, Y/N must confront powerful foes, uncover hidden truths, and master his own growing power to protect the ones he loves and the world he calls home. But lurking in the shadows are secrets about his own past and the true nature of the Numbers he wields, secrets that could change everything he knows.