Amano Jack is a skateboarding teenage troll-quick with a clapback, quicker to vanish before anyone calls him a hero. Then a glitchy app called S.E.D.A. appears on his phone, quietly tallying every cruel comment and every secret good deed into a single running score: his Karma Balance. When the timer hits zero, Jack is ripped out of his gray commuter world and dropped into another one entirely-where his choices have weight, his words leave marks, and the scales he spent years mocking are suddenly very real. Caught between the cynicism that kept him safe and the kindness that keeps catching him off guard, Jack must decide what kind of person he becomes when the whole world is watching the count.