>>24 Perhaps you didn't search hard enough?
https://chan.sankakucomplex.com/?tags=-rating%3Asafe%20serial_experiments_lain%20order%3Apopular
https://gelbooru.com/index.php?page=post&s=list&tags=serial_experiments_lain+-rating%3asafe
https://tbib.org/index.php?page=post&s=list&tags=serial_experiments_lain+-rating%3asafe
https://www.pixiv.net/en/tags/serial_experiments_lain