Karen is a second year student that is in the same class as Jun'ichi. She is an original character that was first introduced in Parallel. She comes from a very rich family like Yuuhi Katagiri and prides herself on acting like a lady.
Karen eventually admits to falling in love with Jun'ichi.
- The name Karen means "flower" (華) (ka) and "love" (恋) (ren).
- Karen's surname Ayanokoji means "design" (綾) (aya), "small" (小) (kou) and "street" (路) (ji).