Prince Ripper! (激しい戦い来る!, Hageshii Tatakai Kuru!) is the twelfth volume of the Katekyō Hitman Reborn! manga.
- Chapter 99: Xanxus' Smile (Xanxus no Emi, Xanxusの笑み)
- Chapter 100: Prince the Ripper (Purinzu za Rippā, プリンズ·ザ·リッパー)
- Chapter 101: Hayato Gokudera vs. Belphegor (Gokudera Hayato VS. Berufegōru, 獄寺隼人VS.ベルフェゴール)
- Chapter 102: Genius's Knife (Tensai no Naifu, 天才のナイフ)
- Chapter 103: Surging Waves Attack (Dotō no Seme, 怒涛の攻め)
- Chapter 104: End (Kecchaku, 決着)
- Chapter 105: Hibari's Return (Hibari Modoru, 雲雀戻る)
- Chapter 106: Yamamoto's Choice (Yamamoto Takeshi no Sentaku, 山本武の選択)
- Chapter 107: Takeshi Yamamoto vs. Superbi Squalo (Yamamoto Takeshi VS. Superubi Sukuāro, 山本 武VS.スペルビ·スクアーロ)
Tsuna's ring is taken from him for having interfered in Lambo's fight. As such, the battle continues with a tie, but with the Varia having one more ring than the Vongola. The fight of the Storm Guardians starts between Gokudera and Belphegor, who battle inside Nanimori High. Belphegor uses "flying" knives to stop all of Gokudera's dynamites. However, Gokudera discovers that all the knives are attached to threads, and manages to injure Bel by improving the movements of his bombs. When the school starts exploding, Gokudera heeds Tsuna's advice of escaping which results in his loss. As Xanxus hints that something happened to the 9th boss, Iemitsu returns to Italy to see what happened to the boss. Meanwhile, the fight between Yamamoto and Superbi Squalo, the swordsman who attacked some time ago, starts at an underground level of the school.