Shujinkou Nikki

From Lovesick Alley:
With a famous manga artist mom and a popular captain of the basketball club brother, Aoi grew up feeling inferior. With the help of her brother, Itsuki, and her classmate who is also Itsuki’s friend, Sena, their goal is to boost Aoi’s self-confidence by trying to fall in love with shoujo manga as a reference.