Our promise, our love.{lenxmiku}

Len and miku were best friends and always toguether , they were 5 years old . Len was so happy to be with her and he always loved her , and he promise her that they'll get married when they grow up . They were so happy toguether, since that day, when miku told len that she had to manage with her parents to AMERICA for some business, she left him heart brocked , but told him that she'll be back and she'll keep their promise.
"After 10 years... you'll be back her for me?"
"Yes i'll ... you just have to wait for me 10 years len-kun".
"I promise! And i promise you i'll never forget you!
"I promise i'll always love you len-kun"
.... but after these 10 years , is miku going to keep this promise or just broke it , is she going to accept his feeling for her or just don't care about it , is she going to love him like he did ? (So much question XD)