Seiji Kisaragi is a long-haired teacher introduced along with Hamada in Episode 1. He and Johji Koizumi have good chemistry. He cut Yukari Hayasaka's hair in Episode 1.
In Episode 5, he is nicknamed "sparkle alien" by Miwako Sakurada. It turns out he is doing fashion for the shooting job that Mikako Kouda sets up Yukari for.