Akashi family and (L/N) family are very close .You we're a childhood friend of Akashi Seijuro. Akashi developed a feelings for you even if you two are still young. So his mother likes you, so the three of you made promise that you will get married and make a great family. Until one day, Akashi's mother died, he's grades start to dropping, he ignores you and focuse on his studys. You study in America to forget everything. After 2 years, you came back to start new life with him.
Are you going to fulfill your promise?
Is he still loves you?
Or the main question is: what will happen to the promise?
The answer is in the book.