Atobe throws a birthday party that somehow matters more than actual tennis matches because every character gets a moment that rewrites how you see them. The games are permission for the show to stop pretending and just let these people be ridiculous together, which is what fans actually wanted all along. If you've been waiting for the entire cast in one place with nothing to prove except friendship, this is the gift the title promises.

Atobe Keigo, the wealthy and proud captain of Hyoutei's tennis team, throws a lavish birthday celebration for his friend and teammate Kabaji. He invites players from schools across the middle school tennis circuit to a one-day festival that shows off his taste for luxury. The gathered players end up competing in events that have nothing to do with tennis: dancing, swimming, soccer and more. The biggest attraction is a heated relay race between every school in attendance. This comedic sports film brings the familiar cast together for a day of over-the-top fun.