[Haikyuu!! Fanfiction + Dual Male Leads + Main Character is the Bottom + Pure and Satisfying Story + Pampered by the Group + Match Play + Movie Included] CP: Ushijima Wakatoshi

[The story begins with the protagonist's first year on Ushijima Island, then returns to the main anime storyline in over forty chapters. Later chapters include scenes of him joining the national team and competing in the Olympics. The male protagonist is ambitious, assertive, and spirited, pursuing both competition and romance. He has a substantial backlog of chapters.]

Rinichi Hyakukawa, of mixed Japanese and American descent, is a setter at a prestigious high school known for his genius. During his vacation, he returns to Japan at the request of his grandfather, who is retired in Miyagi Prefecture. By chance, he wanders into Shiratorizawa, is spotted by Coach Washi, participates in a competition at a young age and wins the national championship. He then smoothly advances to the national team and ultimately wins the title of the world's number one setter!

Rinichi always thought he was domineering and arrogant, and that the perpetually cold-faced Ushijima Wakatoshi was his nemesis. Until one day, he discovered that Ushijima Wakatoshi's phone wallpaper was him... What a coincidence! Perfect timing to bring him home and start dating!

[High-scoring, low-defense, cold-faced opposite hitter × Confident, hot-tempered genius setter]

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Oikawa Tetsu: If I want to do better, I have to defeat Rinichi!

Grinding: Rinichi does everything very well.

Kageyama: Luckily, we're not on the same team.

Gong You: If it weren't for him, I would be the only choice for setter on the national team.

Hinata Shoyo: One day I will stop his pass and make Rinichi completely acknowledge me!

Ushiwaka: ...Don't go, you're from Shiratorizawa.

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!

What? There's Echizen Nanjiro here... I want to play tennis, I want to play with skills that make people cheer, to hit super-powerful tennis balls that make a continuous "boom," and to smash a wall with one shot? I can do that too!

When a child who has loved basketball since childhood and idolized Mitsui Hisashi is reborn into Kuroko's Basketball, how will he, without exceptional talent, stand out from the many super-powered basketball players? Is it Mitsui's never-say-die spirit, his gentle shooting touch, or his strong physique? Coach, I want to play basketball!

Ryusei, from the Blue Prison world, suddenly enters Kuroko's Basketball world, transforming all his soccer skills into basketball skills! What does it mean that he still has the Blue Prison character card in his mind? What kind of chemistry will this create? Will he be eliminated or create his own "miracle"?...

Who would understand! Transmigrated into the world of Prince of Tennis, the orphan Rinji Kanzaki not only has money and an apartment, but also carries the lingering soul of a DNF Elementalist! He knows that Seigaku has Tezuka, Hyotei has Atobe, and Rikkai has that "Child of God" Yukimura—but that doesn't stop him from secretly rolling around since elementary school: old YONEX rackets wrapped in black straps, bandages hidden in his cuffs for extra practice, and obsidian earrings that represent his obsession with "adulthood".

Once he entered Rikkai, he transformed from a "Gray Feather Falcon" into a "Silver Tyrant": 175cm tall with shoulders as broad as Sanada's, his team uniform open, revealing an old scar on his collarbone, he tossed a coin from another world before matches to determine his serve, and his wristbands embroidered with "King's Gambit" were a blatant provocation. While others played with spin, he played with elements: lightning-enhanced defenses, ice walls locking down half the court, and with a single placement of a void ball, all the opponent's balls were sucked away to the landing point he desired!

"Even Ryuzaki Sumire can be a coach! Why can't I be one?!" "Self-study? What's so difficult about that? Besides, I'm a master at making motivational speeches!" Makihara Keiji, wearing an apron, said. ...

Lin Yue, a transmigrator, enters the world of Prince of Tennis with all the superpowers from "Under One Person": he can serve at 200 km/h with "Qi", predict the entire game with "Feng Hou Qi Men", have unlimited endurance with "Liu Ku Xian Zei", and copy ultimate moves with "Tong Tian Lu", creating a storm of superpowers on the court.

From his stunning debut in the Seigaku entrance exam to his steady performance as a "game-changer" in the Metropolitan Tournament and the National Tournament, he has secured 80% of the key singles victories with his aggressive attacks. He not only protects the growth of original characters such as Ryoma and Fuji, but also avoids stealing classic battles, repeatedly creating memorable moments of "skill crushing".

Traveled to the Prince of Tennis and became a member of the Hyotei tennis club.

The competition is about to start... I feel so weak and frail, what should I do?

Miyashita Rin suddenly discovered that as long as she took care of her health, she could continuously improve her strength!

Strength, speed, skill, mental strength...

Make up for it!

Essence, Qi, Spirit… Mind, Eye, Manas, Alaya…

Make up for it!

The supreme realm, the dimensional world?

Make up for it!

Suddenly looking back, Miyashita Rin was about to take care of herself, take a walk with Big Bear, drink some more tea and lie down, but she found that she had already stood on top of the world...

Levels: Cannon Fodder, Regional, Metropolitan Competition, Kanto, National, World (Physical, Mental), Ultimate (Three Paths Ultimate)

ps: I really don’t know how to write an introduction, please move to the main text~