If you want to download raw light novels legally and in high quality, use these services. You will need a Japanese address (for credit card verification) and potentially a VPN, but most work internationally.
Originally for web novels from Syosetu, this site has a massive library of raw light novel volumes in PDF and EPUB. download raw light novels
to see which raws are finally getting professional translations. where you can legally purchase raws? If you want to download raw light novels
For the final, illustrated versions of your favorite series, official Japanese e-bookstores are the primary source. to see which raws are finally getting professional
Most light novels start as web novels on free-to-read sites. These are "raw" in the sense that they are the original Japanese text as written by the author before professional editing.
Happy reading, and 良い読書を! (Yoi dokusho wo!)