|Manga Debut||Chapter 22|
Iyo (イヨ, Iyo) is a second-year student currently attending Nangokuren High School under Rino's faction.
She seen wearing the female uniform of the school. She has long hair and seen wearing a black cloth canceling her mouth.
Brawl Between Two Factions
Prior the road to the Battle Royale, Iyo briefly fought against Shū  whilst joining Rino in battling against Ryōko and the Third Years students, leaving trails of destruction in the academy grounds.
As the Battle Royale for the seal commenced, Iyo infiltrated into the Secret Hot Spring to spy on the Cheerleader Honori for the Royal Seal's whereabouts. Rintaro's presence in the Hot Spring however prompted Iyo to turn her attention towards him instead, by disguising herself as Ayane in order to approach him. 
- Art of Disguise (変化マスクの術, Zawachin no Jutsu):
- Ninja Art - Katon no Jutsu (忍法 火遁の術, Ninpō Katon no Jutsu):
- Kakuren-ryuu no Jutsu - Kamaitachi (隠鎌流忍術 鎌鼬, Kakuren-ryū Ninjutsu Kamaitachi):