itch.io

This is somewhat vague but this is best I can do with this vague request 

MonCurse by Kamoo

Monmusu Rancher by Team Fuel 

if ur talking about monster masume that manga probably isnt hosted here since that would likely need the authors permission 

and if ur talking about MONMUSU the steam game.... its on steam and i guess here's a link to that https://store.steampowered.com/app/533540/MONMUSU/