Kishuku Gakkou no Juliet

Synopsis

Inuzuka and Persia made a promise to associate and celebrate their one month anniversary. At that time the school was awed by a student's recovery. The student's name is Char's, the first Princess of Principality of West 'Chartreux Westia'. She walks roughly on the red carpet, receiving cheers from White Cats students. Char's' words will not be effective with Inuzuka who tried to challenge her on behalf of Black Dogs students who repel that figure. Everything changed when she told him that she knew about his secret relionship with Juliet Persia, one of the leaders of the White Cats. Knowing that all of Juliet's work would be undone if their secret were found out, Romio begrudgingly accepts the role of Princess Char's lapdog, forced to answer her every beck and call lest she tell their secret to everyone else in the academy.

(Source: Boarding School Juliet Wiki, James Beckett's review on the Anime News Network)