Sagan Irisu

Name: Iris Sagan
Sex: Female
Age: 18
Birthday: October 26
Profession: Sekiba High Senior, Internet Idol
Likes: Singing, Dancing, The Occult, Irises, Mizuki, Friends
Dislikes: Scary people
Hobbies: Singing, Dancing, Let's Plays/Game Commentary
Skills: Runs extremely fast

Iris is an internet idol (musician) belonging to the entertainment office Lemniscate. Her stage name is "A-set," but her fans call her "Tesa" ("Aseton" in Japanese). She is Hitomi's daughter and good friends with Mizuki, Kizuna, Amame, Ota, and many others.

Spoiler

She's the illegitimate daughter of So Sejima and Manaka Iwai, taken in by Hitomi following her birth and Manaka's death.