Hiro is one of the main characters in the anime series Hidamari Sketch. She is a senior student living in the Hidamari Apartments, known for her responsible and caring nature. Hiro is close friends with Sae and often acts as the 'big sister' figure among the group. She is health-conscious and sometimes worries about her weight, but is always supportive of her friends. Her role in the series is to provide guidance and stability to the other residents, especially Yuno.