Rin Jandara

Rin Jandara is Teppei's senpai from Mikawa in Aichi Prefecture. She is introduced by Teppei (even before he appears) at the end of Episode 1 of Season 2, but doesn't appear again until briefly at the end of episode 7 of Season 2.

Background
She is probably a 2nd year high school student at Tagane High School, so likely 17 years old. She is very serious and considers her hoppy to be reading. She knows much about regional history, but is disappointed that her home region of Mikawa was merged into Aichi Prefecture rather than remaining a stand-alone Nukata Prefecture.