Manthika

Summary is misleading.  Women, kidnapped and dropped in another world to be forced to become the wives of multiple men to be used as fuel tanks, more like.  Men just straight up absorbing 'mana' from the women through sex like- wtf?  I think I'd have a more positive opinion if women were even given the option of saying 'I don't like any of you' but that doesn't seem to be the case.  Maybe it is and the main character is just an idiot who asks zero questions and goes with the flow immediately to 'get some' because of whatever weird backstory she has.  I don't care, I couldn't stick around long enough to find out honestly.  Maybe some people like the idea of being fought over by physically attractive guys at the expense of their own autonomy but.  That is not a healthy relationship by far. 

Far from being 'treated like a goddess' arriving to a place full of nobles in a gilded cage, being 'picked' by a couple of guys who are arguing over who gets to have you, suddenly having sex, and then being forced to go to an 'institute' to 'teach you how to live' and being forced to wear skimpy clothes?!  You can pretty it up all you want... it's just slavery.  It treats the women terribly.  It's disgusting. 

Anyone with an ounce of feminism or desire for fair treatment won't be able to stand this. 

The world building is somewhat ineteresting.  The magic system has potential other than the sex reliance.  But between the treatment of women and also the treatment of all the men who aren't super rich and powerful?  Nope, hate that.