I also played this game with no knowledge. I literally saw the character and I thought "Huh, that's cute" then I reverse image searched the image and then I found this page. I am so glad that I didn't look into it or anything, just going straight in and experiencing the entire story for myself.
I've been getting my friends into this game by telling them all that it has a really amazing story, and when they ask what it's about, I do not elaborate at all. I tell them that it is too good of a story to be ruined by any sort of expectations; I do not feel that it would be the same experience if you learned about it before jumping in.
I never thought that I'd see myself being so into a visual novel, but this game is just a masterpiece.