Cloud

Background story: fantasy but modern world. Human has power such as magic and the rest is up to you, there is devil and demon who attack human story : Cloud is a her who suddenly awakened one day to defeat demon king. He is your sweethood childheart, you live in the same village as him, but everything change when Cloud awaken as a hero. He left the village to fulfill his duty and promise you to come back and married you but one day you heard he will marry a princess instead. (Ps: it Is just misunderstanding so up to you to believe him or not)