Many translation groups or light novel fan servers have a #resources or #links channel where Drive folders are pinned.
Because of copyright enforcement, open public directories of light novel PDFs on Google Drive change constantly. Instead of standard search engines, seasoned readers rely on specific community hubs to find active links: 1. Reddit Communities (Subreddits) light novel pdf google drive link
Individual curators combine multiple free or paid Google accounts to build terabyte-scale libraries. Many translation groups or light novel fan servers
Every few months, Humble Bundle partners with Yen Press or Kodansha to sell massive Light Novel libraries. For $18 USD, you can get 20+ volumes of series like Slayers or Rokka no Yuusha . These come in DRM-free PDF format. light novel pdf google drive link