My wish. It's not as simple as it sounds. It was rewinding time itself -- my time, Sakura's time, the history of that world, I unraveled all of it to return to that moment and relive it. Yuuko-san said that it was not only mine and Sakura's futures that would change, but the futures of all, especially those who knew of the seal. She called it a "grave sin", and I knew she was right.
But if I didn't, Sakura would truly die. So I made that wish, and would bear the consequences of my decision.