Tsuna, a timid junior high student, is a failure at school, sports, and social life. But everything around Tsuna has been completely changed when a baby called Reborn, who claims to be an Italian hit man from Vongola family shows up! Reborn was sent to groom Tsuna for his future life as a mafia boss of the family!
S01:E01 - What!? I'm a Tenth-Generation Mafia Boss!?
Tsunayoshi Sawada, otherwise known as Tsuna, is bad at studying, bad at sports, and clumsy at everything he does. But one day, a strange tutor appears before him.
S01:E02 - The End of School?!
An unexpected transfer student, Hayato Gokudera, arrives in Tsuna's class, and for some reason, Gokudera hates Tsuna right from the beginning. Meanwhile, Reborn forces Tsuna to participate in a volleyball match.
S01:E03 - Shocking! Cooking With Love and Horror!
Two strangers arrived in town, searching for Tsuna's house. Meanwhile, Tsuna has become friends with Yamamoto and Gokudera, who is actually a member of the Vongola family.
S01:E04 - Eek! a Maiden's Heart Can Destroy!
Haru Miura is a girl who has been secretly watching Reborn ever since she fell in love with him at first sight. She finally makes her move but when she talks with Reborn, she gets the impression from Reborn's words that Tsuna is a bad influence on him.
S01:E05 - The Leader of the Disciplinary Committee Kills Time.
The Disciplinary Commitee has immense power in Namimoi Middle School, the school that Tsuna attends. School council leader and head Disciplinary Commitee member Kyoya Hibari is the leader of the delinquents, and mercilessly attacks anyone who is weak.
S01:E07 - To the Limit! Passionate Brother!
Tsuna goes to school in deathperation mode. When he returns to normal, he notices that he was dragging someone as he ran. The boy turns out to be Ryohei Sasagawa.
S01:E08 - The Senior Boss Cares About the Family.
Tsuna returns home as usual only to find a black car and a bunch of frightening faces waiting for him. Tsuna rushes to his room and opens his door to find a young man quietly sitting in a luxurious chair. The young man's name is Dino.
S01:E10 - Gahaha! the Exploding Lunch Box!
Tsuna forgets his lunch at his house and Lambo ends up taking it to him. When Lambo bumps into I-Pin, who is carrying nitroglycerine to her master, a mix-up of packages results in a riot at school!
S01:E12 - Master's Training! Strengthening Program
When Nana tells Gokudera to take care of Tsuna, Gokudera is glad that he's been acknowledged as Tsuna's right-hand man. But when he is unable to protect Tsuna from bees, Gokudera is embarrassed.
S01:E13 - New Spring! the Hundred Million Yen Contest
The new year has come, but Tsuna’s life is still chaotic as Reborn declares that the customary Vongola New Year Inter-family Battle will be held—with Dino’s Chiavarone Family as their opponents!
S01:E15 - Clash! Survival Snow Battle
Reborn has plotted yet another competition, as the group is split up into two teams and a snowball fight begins. What started as innocent winter fun has turned into a battle for survival!
S01:E16 - Escape From Death Mountain!
Reborn appears to tell Tsuna that the place they're visiting is built exactly like Death Mountain, a secret Vongola training ground that has a survival rate of one in a hundred!
S01:E19 - 100% Accuracy? Rankings for Everything
A boy named Futa, who is being chased by Mafioso, stumbles across Tsuna. Futa is an informant known as Ranking Futa, and it is said that you can control the world if you get hold of his ranking book.
S01:E20 - Sudden Attack
A sudden series of attacks have targeted Namimori Middle School's prefects. Hibari, who went to crush the perpetrator, has yet to come back. According to Ryohei, Kokuyo Middle School students are behind the attacks.
S01:E22 - Unforeseen Evil Influence
Yamamoto narrowly wins in battle against Ken Joshima, but Tsuna regrets the fact that he was a burden. Now Bianchi must contend against the girl named M. M., and then the assassin named Birds takes Kyoko and Haru hostage.
S01:E30 - Hide and Seek on a Luxury Cruise
Nana wins a magazine prize for a trip to a southern paradise on a luxurious cruise ship. Tsuna is ready to enjoy some rare peace and relaxation…but why are Reborn and the others on the same luxurious cruise ship?
S01:E32 - A Shark Showed Up in the Public Pool
Tsuna cannot swim, and doesn't want to look bad in front of Kyoko. Fortunately Yamamoto proposes to help him practice at the public pool, but offers overly abstract advice.
S01:E33 - A Summer Filled With Debt?
Tsuna has taken on a summer job to pay off a debt caused by Lambo, but at his beach workplace he encounters some unsavory high school students who also turn out to be his superiors.