Beichen Xi, a boy shrouded in mystery, hails from the mythical and legendary land of Huaxia. He's widely hailed as the most likely candidate to win the world's junior tennis championship. He loves tennis, yet he's never seriously challenged his opponents. He loves competition, yet he never lets his opponents score a single point. He loves a challenge, yet he exploits his opponents' strengths. －－－－－－－－－...[A little confusing]

Niwakawa has been a fan of Regao for ten years. One ordinary day, when he was about to go out to eat rice noodle rolls, he was sent to the Regao world by a truck that was supposed to take the boy next to him to another world due to a novice driving error. From then on, he embarked on a journey of glory with a pair of fists. First, he followed Serizawa to dominate Suzuran in the first year. In the second year, he fought a legendary battle with Bouya Harumichi and Hayashida Megumi. In the third year, he became the first man to dominate Suzuran. After graduation, he joined the Kowloon Buddhist Association. With his powerful strength, he became the wakagashi of the Buddhist Association. After helping the Kowloon Association to unify the sword area, he became the strongest combat force of the Kowloon Association. Under his leadership, the Kowloon Association successfully defeated powerful enemies one after another and became a truly terrifying Dark Empire.