You are the ghost girl Luna. The two girls who live in the house (Elsa and Julia) have actions they can do only when you "attune" to them, which basically means you kind of possess them. This costs energy points.
Each morning you receive +40 energy points as Luna. Certain actions have to be performed when you are attuned to Elsa, others when you are attuned to Julia. If you click the "i" icon in the top right it's basically a walkthrough of what you need to do for each achievement, scene. The problem is that they are VERY slow to develop and since anything worth doing costs 10-20 energy points a day, you can really only do 2-3 things a day, max, before you have to go to sleep and then get another +40. And you will do this over, and over, and over, and over. 2-3 actions a day.
And some of these actions can only be done once a day, and others require 10 or 20 points to do.
So you can sit there and look at this and say "I have to do this for 193 days!?" and yes, you do.