"Sea", "Clam", "Rainbow" is the 202nd episode of the Katekyo Hitman Reborn! anime series.
Byakuran stares at Giotto and Tsuna confused as to what was happening. After a moment's silence, Byakuran regains his cocky attitude, and asks Tsuna who the man in front of him was. Uni, quickly answers this question, saying that the person who had appeared was the First Generation Vongola Boss, Giotto.
Byakuran laughs at Uni's answer, asking her to stop joking around, and instead tells Tsuna that to use a hologram of his ancestors, wasn't a nice thing to do.
Uni explains that powers of the Tri-ni-sette elements. She says that a song had been engraved to her memory since birth, "The Sea knows no bounds, the Clam passes down its form from Generation to Generation, and the Rainbow appears from time to time before fading away." She explains that Sea means Mare, Clam means Vongola, and Rainbow means Arcobaleno, and the song represents the different natures of the three Tri-ni-sette elements.
Uni finishes off her explanation by saying that, just as Byakuran can gain knowledge and power from Parallel Worlds, Tsuna is able to inherit the "Time" of the Vongola.
Byakuran doesn't believe Uni's story, pointing out that he got the ability to peer into Parallel Worlds before he got the Mare Ring. Uni however, tells him that this only happened because the Mare Ring had already chosen Byakuran as its rightful bearer, just as Giotto had chosen Tsuna as his rightful successor.
Giotto looks at Tsuna, and tells him that this was no longer necessary, as he believes that Tsuna will understand the true purpose of the Rings, and carry on his will.
It wasn't just Tsuna who stared at his ring, shocked at the change. Everyone of his Guardians were staring at their own rings, which had changed along with Tsuna's. Giotto had released the rings which hadn't been seen for Eight Generations of the Vongola Family, the Original Vongola Rings had been released.
As Tsuna continues to stare at his new Ring, Giotto puts his hand on Tsuna's shoulder, smiles, and tells his to give the "Mare Boy" a scare, before leaving, having given his descendant the true power of the Vongola.
Byakuran, acknowledges the change in Tsuna, but still confident, he changes his right arm into that of the White Dragon and sets off to attack Tsuna.
Tsuna's allies stare, stunned at Tsuna's boost in strength, and his utter dominance in battle. Tsuna calls out to Byakuran as he burns Byakuran's wings. He asks him if he's been reduced to a human, now that he had lost his wing, but this statement wasn't met by Byakuran's normal, cocky, carefree voice, but by quite a sinister laugh.
Byakuran laughs, sounding happy rather than worried, he states, quite excitedly that the Tsuna in front of him was amazing. The smoke around Byakuran clears, to reveal a blood stained Byakuran, but he didn't seem worried about the injuries at all, on the contrary, he looked quite happy.
Byakuran continues his maniac like laugh, and says that he's been to many parallel worlds, but this was the first time he's received this much damage. His eyes glinting in excitement, Byakuran says that he's happy, and that he never expected this day to come, and as new Black Wings emerge from Byakuran, he says that he can finally use his full power.
Tsuna looks at Byakuran's new wings, and comments that it'll take more than a change in appearance to defeat him. Byakuran laughs his sinister laugh, tells Tsuna to stop joking around, before taking off to resume their battle.
As Byakuran was sent flying, he regains his balance, and uses another version of his box animal, the Black Dragon. Two of these dangerous beasts emerge from Byakuran and heads straight for Tsuna, but Tsuna manages to avoid these dragons, gets to Byakuran, and launches another punch, forcing Byakuran to defend.
Tsuna stares at the Uni, wondering about the incredible amount of Sky Flames surrounding her. Byakuran seemed to understand what was happening, and comments that Uni has now begun feeding her Flames to the pacifiers, Byakuran looks at Uni with a serious expression, and asks her in a grave tone, if she was seriously going to sacrifice her life to the pacifiers.
Uni’s friends couldn’t believe what Uni was planning, they try to talk her out of it, to stop her from sacrificing her life, Kyoko and Haru in particular were in tears telling her to stop her, but Uni had a sad yet determined expression on her face, her mind was set.
Tsuna calls out to Uni, telling her to stop, telling her that they’ll find another way, but Uni responds to Tsuna in a sad tone, telling him that this needed to be done in order to send Tsuna and the rest safely back to the past, and also, in doing so she would save countless lives. She continues in her sad tone, that she finally has the power to use her power for good, saying that this was the only gamble she could take, a moment which she couldn’t avoid, she tells them that this was her fate.
As Tsuna and Byakuran resume their battle, Mukuro Rokudo states that they (the allies) couldn’t afford to just sit and watch the battle, he states that it was time they broke the barrier and rescued Uni. Dino agrees, saying that regardless of what Uni decides to do, she was in too much danger, being in the firing range of such a fierce battle.
Each one of the allies agree, and start attacking the barrier, attempting to break it, but, as Gokudera pointed out, no matter what they did, the barrier wouldn’t flinch.
Tsuna and Byakuran continue to trade blows, and after a while they both take a step back, feeling the effects of the battle. Tsuna acknowledges Byakuran’s strength, telling him that Byakuran wasn’t kidding when he said he hadn’t even got started earlier, Byakuran returns the compliment, telling Tsuna that he had never expected him to be this strong. But Byakuran looks towards Uni telling Tsuna, that in the end, Uni will be his. However, upon seeing Uni, Byakuran seemed to have a confused look, Tsuna, looks towards Uni as well, to see what Byakuran was staring at.
Uni’s flames seemed to be shrinking, she falls on her knees, tears pouring from her eyes. She thinks to herself that she was scared of dying. The allies, who hadn’t figured out what was wrong with Uni, seemed perplexed by this sudden change.
Byakuran looks at the crying Uni, and a smile crosses his face. He comments in a victorious tone, that the reason for this sudden change, was probably because Uni was afraid of dying. Tsuna pleads with Uni, telling her it was ok, that they’ll find another way, but Uni shakes her head sadly, her face brimming with tears, and says there’s no other way and stands up once again, reigniting her flames as she does so.
Amidst the confusion, Basil shouts out “now” as his Box Animal begins to rise. But the strange thing about this was that, Alfin was rising with many more Box Animals, all connected to him.
Everyone watches this new development, realizing that what Basil was attempting, was a Box Combination attack, which consisted of all the Vongola Allies boxes. Reborn looks at this new technique, and says that this might just be enough to break through the barrier.
Basil and Alfin charge towards the barrier and attacks the barrier with this technique, which they dubbed Super Nova Ocean. The attack creates a massive impact, but even a technique of this power could only create a slight crack in the barrier. Basil curses the failure, but a figure leaps towards the crack, saying that a crack was more than enough.
Gamma leaps through the crack and right into the barrier, where he was immediately face-to-face with Uni. Uni looks surprised to see his arrival, but he greets her casually, and tells her it was cold of her to run off again right after they had been reunited. He smiles at Uni and tells her, that his flames are hers to use.
Remembering this, Gamma hugs Uni, and tells her that he won’t let her do this alone, he looks at Uni who still had tears in her eyes and smiles. Gamma’s partners, Nosaru and Tazaru pleads with Gamma to stop what he was doing, but Gamma simply smiles. Uni looks at Gamma, surprised, Gamma smiles at her and tells her if she remembers what she whispered in his ear the day she went to meet Byakuran. He tells her that he never got a chance to give her his reply, he leans towards Uni and whispers something into her ear. This reply makes Uni cry even more, and Gamma tells her that she shouldn’t be so sad when they’re about to set off, telling her kindly, that this wasn’t what her mother taught her. Upon hearing this, Uni hears her mother voice telling her that that she should smile from her heart when she’s happy. Uni smiles upon hearing this and buries her head in Gamma’s chest and begins the final step of her technique.
As allies watch in despair, Uni and Gamma simply disappear, leaving only their clothes behind. Tsuna screams for Gamma and Uni and immediately heads for the place where they stood, just moments ago. Tsuna stares at the remains, and reaches out for Uni’s pacifier. He grabs the pacifier, thinking of Uni, and looks at it with a mixture of sadness and surprise.
Tsuna, who paid no attention to the conversation between the two, still stares at Uni’s pacifier which he was holding in his hand. Byakuran lands a few feet away and blames Tsuna for what had happened. He talks in a depressed tone, saying that he had finally found the missing piece of the puzzle, and now it was gone. He continues by saying that his dream of awakening the Tri-ni-sette, and become the ruler of all space and time was shattered by Tsuna and Uni’s act of friendship. Byakuran, having lost his cool, now screams at Tsuna, asking him if he knew what this meant. But Tsuna seemed to have had enough. He squeezes Uni’s pacifier, and releases a furious amount of flames, that sent Byakuran scurrying back. Byakuran stares at Tsuna, who was now covered with a tornado of flames. Tsuna, who had been silent all this time, finally begins to speak.
Tsuna, his voice packed with anger and sadness, asks Byakuran in a slow tone, who it was that pushed Uni into making such a decision, he turns slightly towards Byakuran, and tells him that he ruined their worlds, which led Uni to do what she did. Tsuna now turns to face Byakuran and tells him, with tears in his eyes, that he was the reason Uni had died. Tsuna, his voice now filled with rage, and his eyes taking on a dangerous look, releases a furious amount of flames, and tells Byakuran, that he alone, he will never forgive.
The release of Tsuna’s Flames begins to crack the previously said unbreakable barrier. But Byakuran wasn’t moved. He looks at Tsuna and scornfully repeats Tsuna’s statement, he begins to laugh, telling Tsuna that he was a joke. He tells Tsuna that he might have been able to understand Tsuna’s reaction had he viewed Uni as a powerful tool, after all, Uni had the power to make him a god, but the fact that he treated Uni as an ordinary girl was something beyond him.
The allies watch this heated confrontation in baited breath, they notice the roots that had shot out from Byakuran’s leg, and Kikyo immediately understands that Byakuran was stabilizing himself for a final attack, but as Kikyo says this Tsuna changes his own stance. One hand points forward, while the other takes its place behind him. Tsuna then says “Operation-X”, to which gages appear in his eyes. Tsuna was about to counter Byakuran with his own deadly technique, the X-Burner.
The two rivals, full of hate for each other each prepare their own deadly finishers. The heated enemies make use of the preparation period for these attacks, to have one final exchange of thoughts. Byakuran screams at Tsuna that his actions served no purpose, and how Uni and her pacifiers were the best toys he had ever had. Tsuna shouts back at Byakuran, telling him to stop insulting Uni, he stares at Byakuran and tells him ferociously that he was going down. The barrier, unable to withstand the intensity of the Flame release by the two bosses now begins to completely shatter. Byakuran shouts out “Die” and Tsuna, “Take this” as they both release their finishing moves.
The two bosses fire their most powerful techniques, hoping finally to end the battle. These two techniques clash in the center of the battlefield, with the two bosses giving everything they had to make the techniques as powerful as possible. Byakuran and Tsuna scream as they continue to give their techniques more power, the release of these two powers were incredible, as they grow bigger with every passing moment. But soon, Tsuna’s X-Burner begins to overpower Byakuran’s technique, and in a few short moments completely destroys it, and eventually hits Byakuran.
Byakuran screams in agony as the X-Burner hits him, and soon, he begins to remember bits of his past. Byakuran recalls his first meeting with the Cervello. He recalls two of their members approaching him, and offers him the Mare Ring, stating that they have finally found the rightful bearer of the ring. Byakuran laughs upon hearing this and tells them that he’s been waiting for something like this to happen, since he lost faith in the real world long ago. He states that everywhere he went society was just a backdrop, and this became clear after he travelled to the Parallel Worlds. Byakuran tells the Cervello that he’ll take anything that’ll make the world more fun, but warns the Cervello that he’ll use the Mare Ring to its full potential, even dabbing at things like World Domination and Global War. The Cervello promises to never interfere with Byakuran’s plans, but warns him, that if he viewed this as a game, he should be aware that there are two other players in this game. Byakuran welcomes the challenge, stating a game would be boring without rivals.
Byakuran snaps back to the present, and continues to scream in agony as the X-Burner had hit him. He looks at Tsuna and thinks to himself, that he never really hated humans, in fact he felt warm when in the presence of others, he assures himself that he wasn’t being pessimistic, he remembers that he was always good at finding fun things to do, and that he tried his best to have fun, but to him something about the world didn’t seem right, he looks at Tsuna, wanting to see if Tsuna agreed. He see’s Tsuna eyes and laughs, as he realizes that Tsuna didn’t agree with him at all. His final thoughts cross his mind, he laughs thinking it was so bright, and as the Mare Ring slips out of his finger, Byakuran smiles for one last time, accepting his loss.
Byakuran disappears and the barrier shatters, the crater left by Tsuna’s X-Burner was visible for all to see, and as the Mare Ring falls to the ground with a soft “clink”, Tsuna stands victorious, still in his stance for the X-Burner.