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]

The battle for the rings had just begun when Tsuna, from ten years in the future, suddenly arrived from the future. It turned out that the future world had undergone a massive upheaval, and all of Tsuna's guardians had betrayed him.

To free his companions from their shackles and confront the enemies of the future world, Tsuna decides to recruit Xanxus and Byakuran from this era to his side. Unexpectedly, Tsuna awakens a treasure chest system. By following the system's instructions and arriving at designated locations on time, he can open treasure chests and receive rewards.

Arrive at Namimori Middle School, open the S-rank treasure chest, and be rewarded with seven types of Dying Will Flame!

Arrive at Namimori Shrine, open the SS-rank treasure chest, and be rewarded with the strongest box weapon—the Auspicious Cloud Kirin!

Arrive at Chrome's boudoir, open the SSS-rank treasure chest, and be rewarded with a reverse breakthrough to the pinnacle of Dying Will!

Arrive at Fran's hometown, open the SSS-level treasure chest, and be rewarded with the tenth type of Dying Will Flame - Void Flame!

Reborn in the Prince of Tennis world, you begin with the Three-Tama Sharingan. Three-Tama → Mangekyō Sharingan → Eternal Mangekyō Sharingan. On your first day at school, you challenge the Seigaku prodigy, "Your tennis balls are no match for these eyes!" Three-Tama is just the starting point; the path to the Mangekyō, and ultimately the Eternal Mangekyō, has begun! The title of tennis's strongest will be born from these all-seeing Sharingans...