Make sure you have downloaded all the dependencies, like you see in this picture.
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When you open the scene, you will have some options to choose from.
Embody Mode and Possession Mode are for virtual reality. Desktop Mode is for non-VR. Clicking on one will set up the scene for you.
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After that, you can control the scene with the user interface.
Part 1, Part 2, and Part 3 will begin the animations.
If you want to change the girl's appearance, select her and load an appearance preset. Then click "Load Clothing & Physics" to automatically adjust her for the scene.
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(If you are having troubles reading the user interface in English, I recommend using the Google Translate app on your phone, and point it at the screen. It will translate the text for you.)
I hope this helps!