Ouji no Himegoto

Ayame Touka, the ace of the girl's volleyball team, is known as "Prince" because of her tall stature and handsome appearance. But this prince has a hobby she can't tell anyone about... She actually likes erotic TL novels! But there's one more thing he can't tell anyone about... She's a little interested in Asagi-senpai, a fellow library committee member... He's the only one who doesn't call her "Prince", and treats her like a girl... He's such a special person. Then, one day, she finds out Asagi-senpai's secret... The author of the TL novel that Ayame likes is Asagi-senpai!? The two secretive people begin to explore each other.

(Source: Shueisha, translated)