The Kisaragi no Hogyoku app is more of a book than a traditional app. The app opens up to the main menu where you can choose to start the story or learn how to interact with it. The interaction is quite simple with regular taps and swipes to advance the story, touching the screen with two fingers to bring up the menu or three fingers to fast forward through the story. All of these gestures are simple to use and work flawlessly for controlling the pace of the story.