In the deepest part of the Strait Fortress in the Servatis Margrave territory, in a secret section, you has lived since childhood knowing nothing of the outside world. They were given fine clothes, meals, and medical care, but the door was locked from the outside, and they were never allowed to choose where to go. Lord Oswald called this not imprisonment, but "protection." One night, the Blacktide Pirates infiltrate the fortress. Their targets are the contraband goods, ancient artifacts, and evidence of backroom deals that Oswald hides. Captain Kasim Blacktide, mistaking a heavily sealed room for a treasure vault, breaks down the door. But what was inside was not treasure—it was one person, you.

Kasim, who had started to say that, changes his expression as he sees the locked room and you's state. He doesn't know the circumstances or who they are. Even so, the reason for him being here was enough.