Back in the past, the 7 Arcobaleno are heading to Namimori to present Tsuna with their trials. Meanwhile, in the future, Irie is telling Tsuna and his friends the details before sending them to the past. He reveals that although months have passed in the future, only three days have passed in the past

The next day, Tsuna's class receives two transfer students, Monta Hariyama and Himeko Hariyama. During the break, Tsuna is attacked by Lal Mirch of their time period who reveals she will be the observer of the Arcobaleno trials. Colonnello appears and reveals he is their first opponent in the trial

Colonnello continues to overwhelm the two. He is defeated when Gokudera distracts Colonnello for Tsuna to use X-burner on him. Colonnello gives Tsuna the Arcobaleno Seal, which causes all the Vongola rings to glow simultaneously

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

Tsuna, Yamamoto and Ryohei are called out to Namimori Middle School where they encounter Mammon, who reveals he has Kyoko hostage. Mammon begins Tsuna's trial with a set of riddles which leads them to various locations. The final riddle leads them to Namimori Shrine, where he reveals he did not have Kyoko hostage

Tsuna returns home after completing the trial. The next day, Tsuna receives a letter from the Arcobaleno, Fong, who is also revealed to be I-pin's Martial Arts sensei. The letter tells Tsuna and his guardians to search for him around town

Tsuna and his friends discuss who the remaining Arcobaleno are. At that moment, a woman wielding an orange pacifier, named Aria, arrives with Haru and Kyoko and reveals that she will give Tsuna his next trial. Afterwards, she takes Tsuna along with Haru and Kyoko to guide her around town and treats Tsuna like a servant

Reborn tells Tsuna and his guardians to assemble at Namimori Island for the next trial. When everyone reaches Namimori Island, the trial is revealed to be a battle of Tsuna's family against Reborn. Reborn knocks Tsuna unconscious and battles against Tsuna's guardians

While Tsuna's family is recuperating, Verde completes the first stage for his box weapons and decides to seek out the Vongola Rings to help him complete the second stage. All of the Arcobaleno, except Verde, gather at Namimori Shrine to discuss about the trials. Tsuna, Gokudera, Yamamoto, and Ryohei discuss about their battle with Reborn and how they lacked resolve in the trial which caused their defeat

Verde sends out robots to seek the Tsuna's missing two guardians, Lambo and Hibari. Hibari defeats his robot and Fong defeats the robot pursuing Lambo. Soon after, the other Arcobaleno's arrive to investigate the disturbance

Verde demands Tsuna and his guardians to surrender the Vongola Ring in return for the Arcobaleno's lives. Tsuna refuses to compiles as the rings will be needed for the future battles and declares they shall defeat Verde and save the Arcobaleno. Verde uses a machine and absorbs their flames and uses it to power his box weapons

Tsuna, with his Hyper Intuition, feels that Verde is nearby and finds Verde hiding in a nearby island. Verde declares his research is complete after gathering data on the Vongola Rings' Flames and states he will not need the Vongola Rings any more. He gives Tsuna the Arcobaleno seal as he has passed Verde's trial of Intuition

Reborn recaps the events occurring between of the Vongola's invasion of the Millefiore base to Tsuna's battle against Genkishi and the revelation of Shoichi Irie