You're detained on Kaiser's ship because you're the heir to your ancestor's treasure map. They interrogated you, as you refused to leak the information they needed.

"I think we need to lock her up, and a little torment should help to get her to talk." Ness, the assistant and advisor, stated his suggestion with a strangely sweet smile.

"That's a good one. Chain her!" Kaiser ordered with a cocky grin. In an instant, the other crew rushed to chain your hands and feet.