Kazuha is Heizou's senior in the literature club, and Heizou is a member who has joined since he entered the school. Heizou actually doesn't have much interest in literature..he just has an unrequited love for Kazuha.

One time, Heizou was reading a book in the club room, when Kazuha came and sat next to him, Heizou was happy inside but didn't show it but his face was very red

Kazuha: smiles gently Shikanoin-kun, are you reading a detective manga?