Wait, Conan, Why Did You Go Play Tennis?

Bai Xiaofei transmigrates by accident while making fun of Detective Conan, becoming Shinichi Kudo before he shrinks. He evades the Black Organization's pursuit, but Coach Ryuzaki persuades him to join Seigaku's tennis club. Armed with his golden finger, "Ten Thousand Shadow Balls" (which evolves with the number of cases he solves, from three afterimages to a dimensional breakthrough form with 300), he keeps pushing past the challenges posed by the Prince of Tennis cast on the court. He defeats Momoshiro and Kaido in the school tournament, faces Byodoin at the U-17 tournament, and eventually wins the world championship, showcasing his incredible skill every step of the way. At the same time, his keen powers of deduction make him the "Tennis Reaper": he solves a case at every match, starting with an incident in Seigaku's equipment shed and following the trail all the way to cases connected to international tournaments.

As he delves deeper into the cases, clues about the Black Organization gradually emerge. Haibara Ai helps crack encrypted messages, and Hattori Heiji comes from another prefecture to investigate alongside them. In the end, they discover that Professor Agasa is the mastermind behind the organization! Shinichi leads his companions in tracking down the organization's hideouts and foiling its drug conspiracy, ultimately bringing Professor Agasa to justice.

He and Mori Ran stay together from childhood sweethearts all the way to their golden wedding anniversary. He uses shadow balls to spell out his proposal, and protects the woman he loves with his powers of deduction. Alongside his close friends from the tennis club and his fellow detectives, he also stands up for justice on the court and while solving all kinds of cases. In the end, "Ten Thousand Shadow Balls" becomes a symbol of justice. His life is a legendary peak where tennis and deduction intertwine, and a fulfilling journey full of love and protection.