A small kid named Futa bumps into Tsuna. What Tsuna is not aware of is that Futa is a Mafia informant, whose "rankings" are 100% accurate, and this makes him a widely sought-after target, forcing Tsuna and the others to protect him.

Yamamoto and Gokudera begin their training. Whilst Tsuna is in the spike ball, he has a visions of all the Vongola Bosses and their past wrong doings. The bosses demand Tsuna to accept the history of the Vongola but Tsuna refuses. The first Vongola Boss, Vongola Primo, accepts Tsuna as the successor to the Vongola. Tsuna then escapes with the help of his upgraded X-Gloves which now emit the sky flames. Continuing their battle, Tsuna grabs one of Hibari's hedgehog box weapon and releases it on Hibari. Meanwhile, Chrome is shown to be inside an abandoned building.

Mukuro and Hibari continue their battle and Lal appears announcing this is the second trial. Skull calls his pet octopus to combat but Tsuna easily defeats it. Afterwards, he stops Hibari and Mukuro from battling each other and Lal announces Tsuna has passed the second trial, charisma. At night, Monta Hariyama and Himeko Haryiyama are seen plotting a suspicious plan. The next day, Tsuna receives a phone call demanding him to meet the person at school or face dire consequences.

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Hibari defeats Daisy after a short battle and confiscates the Sun Mare Ring. Back at Kawahira's realtor, Yamamoto, Bianchi, Gianni, and Spanner return to the base to search for Squalo. Elsewhere, Byakuran looks at parallel universes and finds where Tsuna and his friends are hiding. Torikabuto manages to enter the realtor and kidnap Yuni by using an illusion and disguising himself as Lambo. Gamma arrives and attacks Torikabuto forcing him to drop Yuni where he then catches her.

A strange infant, Reborn, claiming to be a hitman for the Mafia approaches Tsunayoshi "Tsuna" Sawada. To Tsuna's dismay, he has just been chosen to become the next Vongola boss.

Since Reborn's arrival, Tsuna begins to meet new and strange people. One of those people is Hayato Gokudera, a Mafia member who wants to kill Tsuna in order to become the Vongola boss. Meanwhile, Tsuna is forced to help the volleyball team, including his friend Takeshi Yamamoto, due to his show of strength in the previous episode.

Bianchi is an assassin who believes that love conquers all. So, in order for her love to reach Reborn, she attempts to kill Tsuna to free Reborn's schedule. Meanwhile, a young assassin named Lambo comes after Reborn.

A strange girl, Haru, is seen stalking Tsuna. In fact, Haru is actually trying to follow Reborn. In order to "free" Reborn, she tries to drive away Tsuna by force.

Just when Tsuna is adjusting to his new life, his school's delinquent leader, Kyoya Hibari, is now targeting Tsuna. Fortunately for Tsuna, Hibari is more interested in fighting Reborn.

A strange Chinese infant, I-pin, comes to Japan in order to kill Tsuna.

Tsuna finally meets Kyoko's older brother, Ryohei, but things don't seem to go the way he wanted when Ryohei nags Tsuna to join the boxing club.

Reborn's former student comes to Japan to visit Tsuna; Dino teaches Tsuna what it means to be a Mafia leader.

Tsuna is suddenly stricken with an embarrassing disease. Unfortunately for Tsuna, the only person who can cure it is a doctor who does not like to treat men.

Lambo is given a simple task of giving Tsuna his lunch by Tsuna's mother, but when he bumps into I-pin, who was carrying a box of nitroglycerin, a mix up causes things turn for the worse.

Tsuna is faced with a dilemma when Haru and Kyoko eat a Gyoza bun that proves fatal to normal people. Even worse, there is only one antidote available.

Reborn strengthens the abilities of Gokudera and Yamamoto through specially made "training programs", which appears to be more than an exercise course. When he discovers that Reborn and Tsuna seem to be paying more attention to Yamamoto, however, Gokudera feels left out.

It's New Years and Tsuna and his 'family' has to battle the Chiavorone Family in a traditional Vongola event. Although, the losing family has to pay a price of 100,000,000 Yen.

Tsuna goes to the zoo with Kyoko, and is glad to finally able to be alone with her. Tsuna's ideal "date" does not go as planned, however, as he runs into his friends in the zoo, who are causing all sorts of trouble.

All of Tsuna's friends show up at school during winter to help him babysit I-pin and Lambo. Although, in a turn of events, everyone besides Tsuna seems to just want to have a snowball fight, so Reborn turns it into another one of his staged competitions.

When Reborn drops Tsuna and his friends off on an isolated mountain, he and others become lost in the wilderness of the mountain.

Tsuna is recovering from his wounds from the previous episode and discovers that recovering in peace and quiet isn't possible with not only his friends visiting, but the fact that Hibari is in the same hospital.

It's Valentine's Day Kyoko and Haru are at Tsuna's house to make some chocolate, only to his horror to find that they are being helped by Bianchi. Tsuna and his friends have to find away to get Bianchi away from them before she ends up poisoning the chocolate.

One by one, students at Namimori High are being targeted by an unknown gang. It seems that some of those targets are some of Tsuna's friends, and he has to stop the unknown gang before they attack his friends.

After a battle between Gokudera and Chikusa, one of the gang members; Tsuna, Yamamoto, Gokudera, Bianchi, and Reborn set off to capture and defeat the mysterious gang from Kokuyo, only for Yamamoto to run into trouble right off the bat.