Tama No Gohoubi

Kanoko has never, ever had interactions with boys, but actually, "I want to try touching a boy (innuendo)" is her secret wish...! With that in mind, Kanoko enters high school and meets the strange genius, Tamao, whom she gradually becomes attracted to...? Delusions in full blast! Explosion of hidden desires? The story begins on a "male-relationship" beginner's love!

(Source: Mangadex)