The Reason Why a Young Girl with a grade-skipping Genius, Who Does Not Belong to Anyone, Only to Me / Hakami Kagami GA Bunko

Product description ※Please note that product information is not in full comprehensive meaning because of the machine translation.

In our class, there is a gifted little girl who made a grade-skipping. She looks like a princess and is adorable, but her personality is so cold that she doesn't want to get involved with anyone. I thought that the only thing she opens up is her older sister who is in the same school and is called the Holy Mother. but one day when I gave her some sweets, she became so attached to me? The gifted princess, who was surprisingly quiet, gets attached to me very much with a dere dere. That love never stops, and tries to make friends with her older sister in order to become my sister-in-law --?
This is the story of a beautiful young girl who was lonely because she was a genius, and an ordinary mob boy who is everywhere.