Watch Ryouma! Shinsei Tennis no Ouji-sama - Full movie

The movie features an original story that takes place during the three months between the first manga and its currently running sequel.

Inspired by his tennis champion father, Ryoma is determined to take his game to the next level and train in the US. But in the middle of an intense tennis battle to save his classmate Sakuno from dangerous villains, they somehow find themselves transported back to the past, just as Ryoma’s father is about to undertake his final championship match at the US Open – when he was mysteriously forced to retire. Sing, Dance, and Play along with the innovative 3D digital animation that brings the magnificent and colorful world of The Prince of Tennis to life on the big screen.

(Sources: Natalie, Crunchyroll, edited)