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|Hot Summer Arrives!|
Atsui Natsu Kuru!
|Japanese Release Date||December 2, 2005|
|English Release Date||April 1, 2008|
The Neighboring Town Boys Arrives!
- Chapter 52: Weapon Tuner (Buki Chūnā, 武器チューナー)
- Chapter 53: Operation: Assassinate Tsuna (Tsuna Ansatsu Keikaku, ツナ暗殺計画)
- Chapter 54: Opening of a Swimming Pool (Pūru Hiraki, プール開き)
- Chapter 55: The Tanabata Contest (Tanabata Taikai, 七夕大会)
- Chapter 56: The Case of Lambo's Disappearance (Ranbo Shissō Jiken, ランボ失踪事件)
- Chapter 57: Swimming at the Sea (Kaisui Yoku, 海水欲)
- Chapter 58: Summer Festival (Natsu Matsuri, 夏祭り)
- Chapter 59: Haru's Suspicion (Haru Gishin'anki, ハル疑心暗鬼)
- Chapter 60: A Dare of Courage (Kimodameshi, 肝だめし)
A man called Giannini visits Reborn to make weapon adjustments, but fails each time. When Gokudera is accidentally shot with Lambo's bazooka, he is turned into a small version of himself though ends up thwarting a duo of camouflaged assassins trying to kill Tsuna. In the next days, it is discovered that Tsuna is unable to swim, so all his friends attempt to teach him. Days later, Tsuna is once again taught how to swim, but this time in a competition that a gang made. In other chapters, there is a Halloween party, a Mafia event to entertain senior citizens, a detective game created by Reborn, and a festival in which Tsuna, Gokudera, Yamamoto, and Hibari end up defeating the same gang from the beach.