Think I messed up my experience a bit by using the teleport function at the end of the map a lot, before I understood how to actually make Kana get there herself. When I was already overpowered and wanted to see some scenes before going for endings, the gameplay turned into a scene viewer, as opposed to scenes naturally coming up as you tried to figure what to do.
I never really understood how the spirit procentage worked. I knew it was the main way to help her, but didnt know if you need to clear the whole room, or to some high procentage, or does every enemy defeated make the rest of the enemies in that room weaker. Its the last one. I also knew you could probably track her by that procentage, but I thought it was just 10% difference from where you left it. Its actually almost always 100% completed if she progressed through the room. Exception being when she is hurt and looks for a safe spot. I also didnt know that she always follows the red carpet in the abandoned hospital. Very important because in basement, for example, the red carpet splits in 2 ways, very dangerous room, which the game warns you that you shouldnt let her go through, and elevator, so you basically start the level on one floor and finish on the other, optimally.
And the main way to get stronger is accesories, especially for Kana and her mixing of cards. I didnt even understand what those strengthening facilities do until almost endgame. I would have been forced to check it out again if I didnt use teleport and Kana was too weak to get through the level.
The scenes are really hot, the sounds and moans also. I really liked the story and Hotaru is my fav character in the whole game. If there was one ending where Kana leaves us but we end up with Hotaru, that would be my favourite ending.