On a day out having fun, Tsuna and his friends come across a boy using the Dying Will Flame and is being attacked by a swordsman, but when they try to help, they prove to be no match for him.

Dino manages to fend off the swordsman, Squalo, and explains the situation: a subgroup of the Vongola Family called The Varia is after the Vongola Rings which are held by the leading members of the family, which he then proceeds to give to Tsuna and six other people. They have ten days to train in order to become strong enough to fight off The Varia. Meanwhile, Tsuna's father returns.

Tsuna and the other six members chosen to hold one of the 7 half rings, all start to train, in preparation to face The Varia. Some even get themselves their own home tutors. Meanwhile Tsuna is told that besides him the First Vongola also used gloves, and he will soon find out who the two others with the ring are.

All of them are going through training by their respective tutors. Tsuna is being trained by Reborn, Yamamoto by his father, Gokudera by Dr. Shamal, Ryohei by Colonello and Hibari by Dino.

Under Reborn's instruction, Tsuna embarks on a search to find the missing Lambo. At the same time, Haru is testing Tsuna to find out whether he is still the kind and compassionate Tsuna who had saved her in the river.

A Vongola weapon alteration expert shows up to improve everyone's weapon. Meanwhile, two men appear, aiming to assassinate Tsuna.

All of the selected one are forced to battle against each other who have the same type of rings.

Lussuria and Ryohei fight in a heavily lighted boxing arena. Ryohei is being beaten severely by Lussuria but then Ryohei remembers his sister and the reason he became a boxer. He then gets back up ready to fight.

Ryohei continues his fight with Lussuria. When the battle seems to favour Lussuria, Kyoko & Hana appear and give Ryohei the support he needs to release his Extreme Sun Maximum Canon. Later, Tsuna wonders if Lambo can really fight in the next round. Tsuna then talks with Lambo from 10 years later who tells him not to let 5 year old Lambo use the 10 year Bazooka, for Adult Lambo may be from a future parallel world.

Lambo's fight versus Levi A. Than of Varia. As a 5‑year-old and a 15‑year-old, he stands no chance to the "Levi Volta" attack of Levi. However, when the 15‑year-old Lambo used the 10-year bazooka, Lambo from 20 years later appears. The 25-year-old defeats Leviathan with relative ease using his "Elettrico reverse" and "Elettrico Cornata" techniques, but the 5-minute limit of the 10 Year Bazooka ended, and Lambo reverted to his 5-year-old form. Just as Leviathan is about to severely injure Lambo, Tsuna stops the match in Hyper Dying Will Mode, surprising everyone.

Tsuna's ring is taken from him for having interfered in Lambo's fight. Tsuna's father leaves for Italy, after Xanxus hints at having done something to the 9th boss of Vongola. While Tsuna continues his training, Gokudera is trying to perfect his ultimate technique.

Gokudera fights a losing battle to Belphegor. Belphegor's attacks were somehow going right to him without much effort on Bel's part. However, Gokudera figures out the secret to his trick, and unveils his new technique: Rocket Bombs. However, once Gokudera finally strikes Belphegor, he starts to act strangely.

After Belphegor reveals his true nature, Gokudera lures Belphegor into the library for a final stand. After a brief struggle between the two, Gokudera won, but as the time limit for the match expired, it became a struggle match for the two. Not wanting to lose his friend, Tsuna persuaded Gokudera to abandon the ring. Gokudera's match concludes

The battle for the Ring of Rain between Yamamoto and Squalo is announced. Hibari causes a commotion at the school as the battles have caused major damage to the grounds. Dino reveals that Squalo once defeated the Swords Emperor of the old Varia and that Yamamoto's Shigure Souen Style is useless against him. Yamamoto receives a shinai from his father that transforms into a katana only when using the Shigure Souen Style.

The battle for the Ring of Rain commences. Yamamoto shows off his new Shigure Souen Style and it looks like victory is assured. But slowly Squalo gains the upper hand as none of Yamamoto's attacks are hitting. He then reveals that he can read through all of Yamamoto's moves.

Having crushed the Shigure Souen Style before, Squalo becomes confident once more. Yamamoto manages to hurt him with the 8th Form: Pelting Rain, after Squalo revealed he had encountered a different 8th Form. Yamamoto reveals his newly created 9th Form as Squalo bares his fangs. The Shark and Rain collide on this exciting conclusion.

On Tsuna's side of the world, he is curious to know who is the Guardian of the Mist only to faint at the sight of Chikusa and Ken. At the Vongola Compound in Italy, an attempted recon mission is enacted by Iemitsu to find out what happened to Vongola the 9th. When Tsuna regains consciousness, he and his 'family' find out who is really the Guardian of the Mist.

Having found out that Chrome Dokuro is the Vongola's representative of Guardian of the Mist, Tsuna acknowledges her as a part of the family and allows her to take part in the duel. After many exerted attempts to attack 'Mammon' (now known as Viper of the indigo pacifier), Chrome eventually loses to the illusions. However, the battle does not end and an unexpected person comes in to assist in the battle.

The unexpected person, turned from Chrome, turns out to be Mukuro Rokudo. A series of chaotic illusions battle starts. During the fight, Tsuna experiences flashbacks of Mukuro on how he sacrificed himself for Ken and Chikusa to escape. Mukuro ends up being the winner, almost killing Mammon, who escaped from the battle field with his reserved power. Mukuro fainted after the battle, turning himself back to Chrome.

Everyone in Tsuna's family is worried about the outcome of the Cloud battle. If it's Hibari that's fighting, then they should have a one-hit K.O. no-worry win. However, when it seems that the daunting Gola Mosca is more than he appears to be, even Tsuna, who's still training to complete his Zero-Point, gets very worried.

After the Cloud ring conflict, Xanxus tries retrieve Gola Mosca. After Hibari halts his attempt at retrieval, Mosca goes on a rampage, shooting wildly at everyone friend and foe. Back at the 9th's house it is revealed that the 9th living there is in fact a fake. Tsuna comes to the rescue of his friends and holds off Mosca at which time Mosca attacks Tsuna only.

Tsuna opens Gola Mosca to find the body of the 9th who was its power supply. Xanxus is revealed to have been behind a coup attempt. It is revealed that Tsuna has met the 9th before and that he was the true choice for the position of the 10th Vongola Boss. After which the Sky Match is announced for the next night. Xanxus gives the sky ring to Tsuna before he leaves. The 9th is taken for medical attention and everyone returns home. Tsuna returns to school the next day where he receives an amulet from Kyoko.

As Lambo wakes up from his coma, Gokudera recounts what has happened during the Varia arc.

Everyone arrives at Nami Middle to find Tsuna and Xanxus about to fight. The Cervello put watches on the guardians that poison them and the only antidote is to put the guardian ring in the watch itself. Just before the fight begins Xanxus makes a decisive first strike.

The Battle of the Sky gets started and the strengths of Xanxus and Tsuna are exposed. Not to mention a couple of the guardians seem to be coming around.