A Stable Loop

"You have no idea how dangerous this experiment is." Turns out, Yuma should have given V's words more than a passing consideration. When the portal to the Astral world begins to act up, it's far too late. Yuma is gone. In another time, thirteen-year-old Kaito Tenjo, still mourning his mother's death, has one wish: to finally make a friend. Then a portal opens right above him...