Tatsuya and Miyuki are going through not the best times. Not only did everyone find out that they belong to the Yotsuba family—one of the most mysterious, powerful, and frightening magical families—but they were also shocked by the news that they are not siblings and that they’re even engaged! A string of revelations has led to open distancing from their classmates, including close friends. Meanwhile, the regular meeting of the ten main clans is just about to happen—meant to handle many important issues in the magical world. And this is a great opportunity for the mysterious puppeteer to deliver another terrorist strike…