As Natsu sacrifices himself holding Acnologia back on Tenrou Island, he leaves Wendy with one final promise. What was this promise and how will it affect Wendy during the years he is gone. She will have to go through many trials and difficult challenges, but will she be able keep her end of the promise in the end?

Saved from the tragic event of Tenrou Island, Natsu and Wendy press on to their future as they lived throughout the years of loss and hardship until the day of their friends return. Join as they fought through pain and sadness fate has in store for them and eventually will pave a way for the two to realize their growing feelings for each other. (Split-off route in the canon. NaWen)