Red Tail

is an Ishiyama High School all-girl gang founded by Misaki Oga some time before the series.

It's possibly one of, if not the oldest gang in the school as it was founded before the current Tōhōshinki. The gang was created for the safety of the girls of Ishiyama High School. The current leader, Nene Ōmori was given her title after Aoi Kunieda resigned. The group has a strict policy that any member who has or gains a boyfriend must immediately quit. Furuichi revokes this rule by simply asking Misaki to break that law (which she admitted she couldn't even remember such a law existed).

Current

 * Aoi Kunieda : Third and current Leader.
 * Nene Ōmori: Former Fourth Leader.
 * Chiaki Tanimura: The most silent, and gunslinging member. The Fifth Leader after the graduation and retirement of both Aoi and Nene.
 * Yuka Hanazawa: The most talkative member who is always in others business.
 * Ryōko Asuka: A quieter, sarcastic member with a mask like a stereotypical female Japanese delinquent.
 * Kaoru Umemiya: A taller member with a boyish haircut.

Former

 * Misaki Oga: First Leader & Founder (retired)
 * Ringo Hōjō: Second Leader (retired)
 * Aoi Kunieda: Third Leader (resigned, post retaken after chapter 200)
 * Shizuku Itoi: Former member of the first generation of the Red Tail.
 * Haruka: Former member of the first generation of the Red Tail.