Hoteru Watashi ni Koi wo Oshiete

Miku is a high school student who is very good at fantasizing, but knows nothing about real boys. At school, she hides her interest and acts as a pure character, but one day her childhood friend, Shida, finds out that she's been reading erotic manga! "I thought my life was over...but then Shida-kun asks me if I want to gain some experience with guy...?" It's a romantic comedy about a girl with a delusional brain and a teasing boy. (Source: Kodansha, translated)