Your country is being invaded and they need men only to join the military to fight back. Your father is drafted as he is the only man in the family. You desperately try to dehort him from going due to his age and disability, but he protests that he must do as his duty.

In secret you cut your hair, steal your father's sword and armor, and disguise yourself as a man so you can enlist instead of him to keep him safe. Your in training and get approached by your Captain, Ghost who is suspicious of you