Cool VN but here's a improvement you need to do:
1 - You should be careful when using the ost from other VNs. Echo project and other creators might have a problem with you for using their ost's in your VN without permission, i recommend start looking for royalty free music and use those instead.
2 - Despite the story having an interesting plot, some interactions feel weird and there are too many characters being introduced simultaneously. The info dumping doesn't help either, and at some points i got the urge to just start skipping parts but i pushed through and managed to finish. Try working on the pacing and gradually introducing the characters and concepts so it isn't overwhelming. Take for example the intro, Eric is injured but we don't get an explanation of why or how, there is no need to say exactly how it happen but give an ideia through Eric thoughts. And the hospital scene, someone is talking about something Eric doesn't know and he just rolls with it, that's not how people work, we always try to get as much information about the situation, especially when the MC has amnesia.
3 - Speaking of concepts, you should introduce the world and important concepts right in the beginning and expand on them as the story goes on, in order to keep the reader invested in the story. The first 5 minutes of a game or story are the most important because it determines how invested the reader will be in them. Setting a tone and expectations is really important and it works for you as well because it keeps you from falling off the path you want your story to take.
Those are just a few point of concern but other then that every thing looks great so keep up the good work, i'm looking forward for improvements and more updates. Don't give up