The One Who Returned from Time (Crossover)

He was someone who had returned from another time. Time had passed and driven people toward old age, but he alone had died young and lingered in the world. Time refines our lives, and the years help us grow. The naive boy would eventually understand his own heart. Those who were abandoned, those who were forgotten, would also be remembered. I came to this world for this!, Sakuragi Hanamichi No, you came for me., Rukawa Kaede I only wish time would never change, so they could remain the best versions of themselves and live the best lives. The world is vast. Keep walking, and eventually you'll understand. Theme: I want to hold on to the time that belongs to me and have no regrets