I don't understand what the game is about???
There's an action minigame where you need to identify the correct ghost (the one that's not as faint) and run into her multiple times to deal damage, whilst avoiding touching the clones.
After succeeding at catching her, you get some dialogue with her, and can choose different options to get different endings.
Very short game, but quite well done for what it is. The game makes you save before the dialogue section, so you can easily get the other endings. Getting end 1 unlocks a gallery room, which also has a dress up mode letting you see each scene with different expressions, clothes on or off, etc.