I see https://www.virustotal.com/gui/url/671b2cba83beb308113fc498dba00e0a2607c722206a972b131012c5a0c297a4/detection and https://www.urlvoid.com/scan/9anime.to/ for the site. All reports except one say it's safe. Might help to ask on https://forum.avast.com/index.php to see if it's a false positive for site.

Windows Defender Browser addon, Avira, Comodo Online Security Pro and Emisoft Browser Security are all good choices. Chrome store has them.