In crossover anime, who isn't a childhood friend?

Reincarnated into the body of a five-year-old toddler after a fatal encounter with a truck, Yuan Qianye finds himself navigating an extraordinary childhood alongside familiar faces from across popular anime universes—including Yukinoshita, Ai Hayasaka, and the Takanashi sisters. Far from panicking over his reduced stature, Qianye discovers he possesses a unique system granting him a "God's-eye view" to observe others beyond the limits of physical laws, as well as the ability to bind with them and reap the rewards of their hard-earned skills. Blending the rich, interconnected worlds of beloved slice-of-life series into a seamless narrative, this lighthearted and engaging journey invites both lifelong fans and newcomers alike to experience a fresh, original tale of growth, mischief, and unexpected connections.