The New Student/Childhood Friend

Miku and Len were dating since they were little. But then all of a sudden, everything changed and Miku started moving to another town without telling Len and broke up with him without a reason. After 6 years, Miku bumps into Len in her new town and he transfers to her school. Things start to change again. They had many fights but they got closer and closer. One day, they were forced to marry someone they did not want to marry.