Amane Hasegawa

About

A girl who was in the same kinder-garden class as Hinata. She ended up going to a private elementary and middle school, but was teetering on the border of life and death after Yamatagi Madara forcibly possessed her. She narrowly survived due to the effects of her supernaturally-accelerated spiritual growth. After aging from 12 years to 15 years old during her brief coma, she had a period of rehab, and then returned to school. Her body is now roughly 16 and a half years old, but her mind is still that of a 12 year old. Despite having enough raw spiritual power to be acknowledged by the great demon, her spiritual sense is poor, so she is completely unaware of her situation.

(Source: the manga's character introductions)