Tsukimiya Ringo is the adviser and teacher of Saotome Academy Class A. He is actually an infamous male idol who cross-dresses as a female. At first, it was speculated that he liked cross-dressing, but it was later revealed in the game that, while working as an idol, his agency told him that he looked so cute and forced him to cross-dress in order to get any work!
Another amazing cosplay by Nazs from Thailand! You might remember her since I just featured her as Ikki from Amnesia, and I think she makes a fabulous Ringo as well! Thanks to Rei for sending this in!
Source: Nazs on World Cosplay