Author really builds a strong case for each main girl as the series progresses. I've been Team Osananajimi ever since she became a major character and we got to see how much work Yuri had put into making a place for Itsuki to escape to when he finally had to, only to have that all taken from her without a word and still being willing to help the thieving-cat oujo-sama when her story finally overlapped with this one. Mirei fans have this and plenty more to lean on, though. Miyakajima will come out of her first two major arcs with plenty of fans of her own.