The Mist Guardian Arrives! is the thirteenth volume of the Katekyo Hitman Reborn! series.
- Chapter 108: Shigure Soen Ryu (時雨蒼燕流, Shigure Sōen Ryū?)
- Chapter 109: The Role of the Guardian of Rain (雨の守護者の使命, Ame no shugosha no shimei?)
- Chapter 110: 8th Form: Pouring Rain (八の型篠突く雨, Hachi no kata Shinotsuku Ame?)
- Chapter 111: The Outcome of the Rain Battle (雨の勝負の結末, Ame no shōbu no ketsumatsu?)
- Chapter 112: The Guardian of Mist (霧の守護者, Kiri no shugosha?)
- Chapter 113: Chrome's Attack (クローム襲撃, Kurōmu shūgeki?)
- Chapter 114: Chrome Dokuro vs. Mammon (クローム髑髏
ＶＳ.マーモン, Kurōmu Dokuro vs. Māmon?)
- Chapter 115: Nagi (凪, Nagi?)
- Chapter 116: Mukuro Arrives! (骸来る！, Mukuro kuru!?)
Yamamoto shows the Shigure Soen Style, a sword style which allows him to manipulate the water around him. Squalo reveals that he already knows that style, and both develop their own variations. Yamamoto creates a ninth technique of his style and defeats Squalo, who is attacked by a shark as punishment of his defeat. Before the next fight, Tsuna sees Chikusa Kakimoto and Ken Joshima and thinks the Mist Guardian will be Mukuro Rokudo as a result; instead, a girl called Chrome Dokuro appears. She fights against the Mist Arcobaleno Mammon, and both create illusions to fight, but Chrome lost her concentration and her stomach began to cave in, revealing how she had lost most her organs and that Mukuro has been sustaining her life. With Chrome unable to continue the fight, Mukuro appears in his own form and takes Chrome's place in the fight against Mammon.