Teki wa Ousama

The manga follows the life of Minagawa Nobara, a first year in high school. After having lived on the countryside her entire life she finally gets to go to the city for high school where she is reunited with Shuwa Ibuki. Minagawa met Ibuki five years ago at a party his grandfather had organized. There he had helped her when she was being bullied and the two of them became friends. Now, five years later Minagawa meets Ibuki again but doesn't feel like she had known the real him at all back them. Or did she...?