Roselia Oukoku Monogatari: Himegimi to Utsukushiki Kyuukonshatachi

Synopsis

Roselia's husband is to be chosen at a ball, and suitors from all over the world, princes, have gathered! But Roselia's love interest is a former assassin. Will this love be fulfilled...? (Source: Oozorashuuppan, translated) Note: Also includes Wagamama Hime no Hatsukoi (わがまま姫の初恋).