We have developed our own technology Tapmation™ for Apple Books Author. This allows us to flip through key frames on the same screen. In addition, we can also post reference videos and thumbnail displays. Futhermore, the UI is designed to allow us to post the time-sheet, layout, etc. on the same screen. You can also expand the images, so all the information in each cut can be viewed in detail. The layout is also different from that of paper books, so we can include much more content. E-SAKUGA is a key frames collection of a new era, and is the future.