Monsters, What Will Teach You Love Will Be

[Cthulhu][Low moral protagonist][Multiple female protagonists] Watch out for this man named Ronan who travels to another world and acquires a "beautification system." In the eyes of others, they are scary monsters with bloated limbs, but in Ronan's eyes, they are innocent and lovely cute girls. As long as they are conquered, they can level up, become stronger, and obtain equipment. This time the devil is miserable.