The battle for the rings has ended and Tsuna is enjoying the peace. Reborn suggests that they have an out-of-season "test of courage." Tsuna doesn't like the idea at first, but he learns that Kyoko is participating and becomes eager to pair up with her. But when he gets to the graveyard, all the participants, besides him and Lambo, are doing the scaring. Tsuna is disappointed, but doesn't want to look like a coward in front of Kyoko. He decides to go into the creepy graveyard with Lambo. The two get separated, and when they meet again, Lambo has switched places with Adult Lambo. But for some reason, there's something a little different about Adult Lambo

It's Open House! Tsuna is poor at studying, and for him it’s just a day of terrible experiences. He’s hit with a question he doesn't know the answer to and opens his mouth to give a random answer, but his tutor, Reborn, won't allow that to happen. Reborn is watching from behind the parents to see that Tsuna gets the answer right. But then Lambo and the others come barging in! In the end, the teacher has to leave to carry off Gokudera after he passes from seeing Bianchi. The classroom is unsettled. At that moment, a certain man stands at the front of the class!

One day, Tsuna receives an invitation to a wedding ceremony. The names of the bride and the groom are Bianchi and Reborn! It seems that Nana found her wedding pictures the other day, which made Bianchi crazy about getting married. At first, Tsuna is sure that Reborn would never consent, but when he sees Bianchi in a wedding dress at the church he realizes the ceremony is real. Tsuna goes to the groom's room to congratulate Reborn, but he learns the surprising truth from Dino!

Nana's wallet has been stolen. Angered about dinner, Reborn and the other freeloaders step up to catch the thief. Naturally, Tsuna is dragged along. The Sawada family walks through the shopping district with guards around Nana. The group grabs the attention of three men, the Crime Brothers, who are causing a stir in town. The youngest brother was the one who stole Nana's wallet the day before!

Lambo is beat up by Reborn as usual and is tossed into a neighboring house. The boy living there, Shoichi Irie, goes to the Sawada household to return a box that contains a gifts of thanks from the Bovino Family, the family that Lambo belongs to. But unusual things begin to happen! A beautiful woman sunbathing out of season, a talking baby, an exploding child, and a suspicious black luxury car… Shoichi Irie is confused by the strange happenings and has no chance to return the box.

A dojo buster has appeared in Namimori. Kyoko and Haru see him in action and are angered at how merciless he is, even against children. They are frustrated that they aren't able to do anything. Reborn tells them that Tsuna will defeat the dojo buster for them. Naturally, Tsuna doesn't want to. But when he sees Kyoko's sad expression, he is unable to refuse and begins training. The name of the technique that Reborn is trying to teach Tsuna is called the "Absolute Evil Fist." But for some reason, Reborn won't tell him what kind of fighting style it is

Nezu is a terrible teacher who makes fun of students who get bad grades. On the day he has to return his students’ science tests, he shows the entire class Tsuna's answer sheet, which has received poor marks. Gokudera is angered at Nezu for making fun of Tsuna and confronts him, but Tsuna and Yamamoto stop him from causing any physical harm. Nezu falls over and is angered; he blames Tsuna and his friends for his injuries. He says that they should be expelled. Thanks to Kyoko's pleading, Nezu will forgive them if they retake the science test and get good scores, but…

Everyone suddenly receives an invitation from Reborn to attend a Vongola-style Maman Appreciation Day party. Reborn is holding this event to entertain Nana, who is always taking care of everyone. But with a name that includes “Vongola-style,” it can't be normal. At the party, Nana selects a winner by giving points to people who reveal their secret talents. The chances that the winner's wish will be granted is, amazingly, 100 percent! Everyone wants their wish granted, and the Sawada family living room becomes a place for serious battle with greed swirling all around.