Most likely gonna have multiple endings, the main one is most likely Harem while the others based around charecters who already have alot of relationship, stuff like Mika, Petua, Kira, Kotone, Bella, and Beris etc, etc.
Plot twist: defeating the Demon Queen frfr causes all Monster girls to go back to being bloodthirsty beasts, instead of just thirsty beasts. Either you become Demon Lord and stand at her side, or the world plunges into a living hell.