yukio needs to find her father which I think might be the final boss in this game. cause he is the most wanted samurai in the story. but to find him you need to find certain hidden doors and areas though. that makes the game kind of challenging, and that's why I love it. you need to find a key to one of the locked doors and a secret entrance to the other after you've met up with the old guy in the cave under the waterfall. I hope this helps you struggle as I do.😅😅