Hey! Thanks :3 And that’s awesome that you’re starting your own game dev journey :D
For this project, I’ve used a mixture of asset packs (different artists for backgrounds and spites, etc.), but they’re almost all from Japanese artists!
If it’s the sprites that you’re looking for, I purchased them from DL Site many years ago, but I believe the artist who made the pack also has a store on BOOTH + their own site as well :3 I also changed the colours myself in GIMP because I don’t like to use them as stock sprites if I can help it.
This is it on DL Site: https://www.dlsite.com/home/work/=/product_id/RJ304450.html
And for backgrounds, I probably mixed a few different artists, but it is Minikle’s stuff that I use the most: https://www.dlsite.com/home/circle/profile/=/maker_id/RG08888.html
Just be a lil bit careful when browsing DL Site, cos there is a LOT of hentai porn stuff on there xD I don’t wanna be responsible for you seeing anything you don’t wanna see, haha. I think they have separated the site now so that there is an option to hide or display adult content, but yeah, just thought I'd better warn you about that x3
There are a lot of VN dev assets on DL Site anyhow :3 And artists frequently put their products on sale at discount prices on there as well, so if something is too expensive, you can always wishlist it and see if it goes on sale at some point :D
I hope you have lots of fun with your game dev journey ^-^