Koharu is a member of the Supplemental Lessons Club of Trinity Integrated Academy.
Originally a member of the Justice Actualization Committee, she was forcefully transferred to the Supplemental Lessons Club due to her falling grades and being made to repeat a year.
While she may consider herself elite, she is actually rather stupid.
She has a secret hobby of collecting lewd magazines, and experiences delusions about the most trivial things in everyday life, often to her own embarrassment.