At the meeting of the heads of the Fall Quarter Committees, a girl is surprised to see that a committee would use the reception room but, upon hearing that committee is the disciplinary committee, stops and apologizes immediately to the head, Kyoya Hibari. Hibari then sees three representatives of the tree planting committee and tells them that only one representative is allowed per committee. He then has the three beaten up while Reborn watches them from a distance.
Meanwhile, Tsuna, Yamamoto, and Gokudera are talking about the summer vacation ending abruptly when Reborn, wearing his autumn camouflage Chestnut suit, arrives. While Tsuna scolds him for going to school again, Reborn tells him that they have to make a Family hideout. Yamamoto and Gokudera happily agree and Reborn tells them that their hideout would be the reception room since the furniture view and geographical location are good. Yamamoto and Gokudera head toward the reception room, with Tsuna reluctantly following.
As Yamamoto and Gokudera enter the room, they are surprised to see Hibari inside. Hibari notices Gokudera's cigarette and uses his tonfa to put it out, much to the group's surprise. He then comments on them being weak for forming a group and tells them that he wants to bite them to death. At that moment, an oblivious Tsuna enters the room and is immediately attacked by Hibari who sends him flying. Gokudera and Yamamoto try to retaliate but fail and end up unconscious. Tsuna then gets up and sees Gokudera and Yamamoto unconscious. As Tsuna tries to make heads or tails of the situation, Reborn shoots him with the Dying Will Bullet, giving him the strength to fight back. Hibari is able to dodge his attacks and punches him on the chin. Thinking that he has defeated Tsuna, Hibari turns to beat up the other two but sees Tsuna standing up. Tsuna uses Leon as a slipper and attacks Hibari on the head, angering Hibari. Hibari tries to attack Tsuna but is stopped by Reborn, who uses a bomb to escape.
After Tsuna, Yamamoto, and Gokudera recover, Reborn explains to them that he intentionally wanted them to meet Hibari. Tsuna panics, thinking that Hibari will have his eyes on them, while the other two try to calm him down. Reborn says to himself that Hibari would be a useful guy in the future. Elsewhere, Hibari is thinking about Reborn, wanting to see him again.
Note: Bold + Italicized = First Appearance