Noyama Sakura

She is the second daughter of the Noyama family, who is smart, good-looking, and has excellent grades.
At school she is an honor student and the president of the student council, which well-respected by the students and teachers.
But as soon she is alone with her little brother, her honor student persona dissapears, and she ends hugging him and doting him with sweet voice.
She loves to care about her little brother and spoil him.

From Getchu