Tennis Legend: From Sign-In System to Supreme Champion

An orphan awakens a mysterious sign-in system on his 12th birthday, granting him unparalleled tennis talent in a world of fierce competition. Armed with supernatural abilities earned through daily check-ins, he dominates Japan's elite Rikkaidai academy and crushes America's junior champions. Watch as legendary rivals fall before his unstoppable rise—because in this game, victory isn't earned through sweat alone. It's coded into his destiny.