The story follows a classic "rescue" narrative structure but distinguishes itself through a pirate setting. The protagonist, a young man named , discovers that his beloved older sister, Ryuune , has been kidnapped. However, she hasn't been taken by just anyone—she has been captured by the notorious pirate crew known as the "Black Rose."
If you are looking for a pirate-themed series with similar themes, you might be thinking of:
A cheerful and supportive friend who assists in solving puzzles and navigating the island's terrain.