Seasons & episodes
S4 · E98Declaration of War 2008-09-06 · 25 min
Byakuran calls Irie and tells him that Mukuro has been defeated and that he was found to be transmitting data, possibly to the Vongola Tenth. Byakuran tells Irie that he is the most important person in that base and must escape if they invade the base. Irie for some hidden reason, can't leave. Irie calls all the Milliefore Japan members in the base and tells them he shall be leading the base now. The members are outraged and prepare to attack Irie until a swordsman by the name of Genkishi tells them anyone who opposes master Irie will be killed. Irie becomes the boss of the base. Afterwards the Vongola have received the data transmitted by Mukuro. In it was the picture of the white box Tsuna saw in his dreams. Training is resumed and Reborn gives Yamamoto a box about the sword emperor.
S4 · E99The Final Trial 2008-09-13 · 25 min
Yamamoto watches DVDs of Squalo's battles swordsman in order to learn from them. Tsuna's training with Hibari continues, this time, he tries to use his Vongola Gloves to fire off flames. Yamamoto manages to create a tenth technique for the Shigure no Shouen Style. Yamamoto's training is complete.
S4 · E100The Night Before the Raid 2008-09-20 · 25 min
Yamamoto and Gokudera have finished their training. Meanwhile, Tsuna loses his charm made by Kyoko. Later, he bumps into her and she gives him it back, then the first black spell battle is recapped. Also, Hibari reveals that the Millefiore battle simulation reveals a 0.0024% chance of success for Vongola. Thanks to Glo Xinia, Millefiore now knows where the Vongola Base is.
S4 · E101Night Attack 2008-09-27 · 25 min
Tsuna and the others prepare for their attack the next day. They've been given Marmon covers on their rings which will hide them, dying will resistant clothing, and a communication system. Meanwhile the Millefiore digs their way underground and ends up at where the transmitter was. It turns out Hibari noticed the transmitter and carried it there to lure the Millefiore members away from the base.
S4 · E102Mission Start 2008-10-04 · 25 min
Hibari starts knocking the Millefiore members unconscious one by one. The place he lured them to is revealed to be meant for attacks like this. The Vongola find out that one of the shopping malls ducts lead to the Millefiore base. They enter the ducts only to trigger a trap where lasers prepare to fire on them.
S4 · E103The First Barrier 2008-10-11 · 25 min
Tsuna and the others escape the ducts by breaking it open and falling to the ground below. There they face Dendro Chilum. Tsuna defeats him with the X Burner and they continue in the Millefiore base undetected.
S4 · E104Magician of Fate 2008-10-18 · 25 min
They continue on and encounter GingerBread, a young boy who asks them whether they are after him for revenge for their friend, Colonnello. Lal Mirch battles GingerBread but is severely injured in the process.
S4 · E105Regret 2008-10-25 · 25 min
GingerBread reveals that Colonnello died by saving Viper who then killed himself out of hopelessness. Lal Mirch remembers back to the past before she becomes an incomplete Acrobaleno because Colonnello took her place. She had a blue incomplete pacifier which she promised not to use so she would become human again. In the present time, Lal Mirch uses her pacifier and defeats GingerBread. It was revealed GingerBread was a doll and explodes, injuring Lal Mirch. Just then the alarm goes off informing Millefiore of their presence.
S4 · E106The Student's Maturation 2008-11-01 · 25 min
To avoid being trapped by Millefiore, Lal Mirch volunteers to distract them. Tsuna volunteers in her place since he is the most mobile with his X-Gloves. The team make their way deeper into the base while Tsuna battles Moscas. He is overpowered and gets dragged underwater.
S4 · E107Absolute Desperation 2008-11-08 · 25 min
Tsuna escapes from the grasp of the Moscas and continues his battle. He defeats them the minions but the man named Spanner who pilots the King Mosca remains. Tsuna prepares to give up the fight but Reborn tells him he should use the X Burner in the air. Tsuna defeats the King Mosca but loses consciousness in the process. Spanner leaves the Mosca and prepares to kill Tsuna.
S4 · E108A Man's Box Weapon 2008-11-15 · 25 min
Tsuna's family become worried at the amount Tsuna is gone while they continue searching the base. While crawling through an air duct, they run into Baishana and Nigella fighting. Nigella is then beaten by Baishana box weapon, a snake covered in storm flames. Ryohei decides to fight in place of Yamamto and Gokudera and summons his box weapon Kangayuu, a Kangaroo. Back at Tsuna's scene of the battle, Tsuna and Spanner are nowhere to be found.
S4 · E109Captive 2008-11-22 · 25 min
Tsuna awakens to find himself a captive of Spanner. Spanner tells him he has covered up Tsuna's whereabouts by reporting him as missing to the Millefiore. Meanwhile, Ryohei continues his battle but now in the air as Kangayuu shoots out boots that propel him into the air with the sun flames.
S4 · E110The Secret of Merone Base 2008-11-29 · 25 min
Ryohei defeats Baishana and his box weapon with a move called "Maximum Ingram". Back at the Vongola hideout, Haru is worried about Tsuna and Kyoko is worried about her brother. Ryohei, Gokudera, and Yamamoto continue their way into the base but suddenly the base starts to move.
S4 · E111The Enemy Is Octopus Head 2008-12-06 · 25 min
The base is moved by Irie Shouichi and Ryohei and Gokudera are separated from Yamamoto and Lal Mirch. Ryohei and Gokudera then run into a white spell Millefiore member who uses his box animal of a slime monster to attack them. Gokudera is trapped inside but is then freed by Uri. He then destroys the box animal. Meanwhile Yamamoto with Lal Mirch wanders into a room and is surprised by what he sees.
S4 · E112Boomerang Trap 2008-12-13 · 25 min
Yamamoto ends up in a room full of pipes. There he meets a white-spell Millefiore member who uses a boomerang with the storm flame to attack him. Yamamoto realizes that he could not predict where the attacks are coming from because he is actually fighting twins. Yamamoto defeats them. Irie Shouichi moves the base again and Gokudera and Ryohei run into Gamma.
S4 · E113Lightning Strikes Again 2008-12-20 · 25 min
Ryohei ties up Gokudera with a box weapon to make the battle fair against Gamma. Tsuna meanwhile attempts to escape from Spanner but Reborn who is able to get in contact with him after the base moves closer to the surface, tells him he needs to master the X-Burner or he can not defeat Millefiore. Ryohei is severely injured by Gamma. Hibari continues his way in the subway, surrounded by Milliefiore members once again.
S4 · E114The Storm Guardian, Stands 2008-12-27 · 25 min
Ryohei manages to heal himself and continues his battle with Gamma. He is however defeated by Gamma's Electric Tower technique. Gokudera is free from the ropes and reveals his Sistema C.A.I.
S4 · E115SISTEMA C.A.I 2009-01-10 · 25 min
Gokudera talks about his Sistema C.A.I. and explains how he discovered its use. Hibari continues his way into the subway and uses his box weapon to trap the Millefiore members on the other side. Spanner explains to Tsuna that he will create contact lenses so Tsuna would be able to measure his flame power on his gloves and help him balance his X-burner.
S4 · E116Difference in Resolve 2009-01-17 · 25 min
Gamma manages to open a box to unleash his box animal powers, turning his foxes black in color. Gokudera is defeated, but Gokudera's box animal Uri comes out of Kangayuu's pouch charged with Sun flames as a lepord to defend him.
S4 · E117Storm Fights Back 2009-01-24 · 25 min
It is revealed the Sun flames from Ryohei's box animal was used by Uri to transform. Uri manages to hold back Gamma's box animals while Gokudera deals with Gamma. Meanwhile, Gamma remembers when his family was separate from the Millefiore. In his memory, the boss just died, and her daughter Yuni is the heir.
S4 · E118The Princess's Conviction 2009-01-31 · 25 min
In Gamma's memory, after a failed bargaining with the Millefiore Family, Genkishi returns with injuries to the Giglio Nero family. Yuni decides to meet with Byakuran to prevent any more of her subordinates being hurt. After meeting with him privately, Yuni returns emotionless and a loyal servant to Byakuran. Gamma mentions how Genkishi was the biggest traitor to the Giglio Nero Family and how he wants to defeat Byakuran.
S4 · E119Interval Between Battles 2009-02-07 · 25 min
Lal Mirch recaps what has happened during their invasion of the Milliefiore base up to the point Gokudera's and Gamma's battle.
S4 · E120Virtual Space 2009-02-14 · 25 min
Tsuna needs to be placed in battle so the contacts can be adjusted for the X-burner. Tsuna puts on gears that puts him in a virtual space to fight Moscas; he could die if he dies in that space. Later, Irie Shouichi moves the base again and places a virus in the virtual space and Tsuna must defeat it.
S4 · E121Two Battles 2009-02-21 · 25 min
Yamamoto runs into the same black spell member Nosaru. Meanwhile, Tsuna after a long battle defeats the mysterious Ultimate Cube. Yamamoto in his battle manages to push back his enemy and the base is moved again.