Selection for the Dark Princes

I was tricked into signing a contract. Now I have to go to another world for the selection of brides for a mysterious dark prince who never takes off his mask. To win? No. To sabotage this selection. Wait—when did I end up in the prince’s bed… and his demon brother, who’s also looking for a wife? And how will they “divide” me? Or won’t they? Damn it, I still need to sabotage the selection!