Trinity Seven (2014)
Original Title: トリニティセブン
In this "romantic comedy but sometime serious magical school story," life as Arata Kasuga knows it is wiped out by a bizarre incident known as "Collapse Phenomenon," which causes worldwide destruction and takes his cousin Hijiri Kasuga to the next world. To resolve the "Collapse Phenomenon" and bring back Hijiri, Arata enrolls in the Royal Biblia Academy. Waiting in the school are seven beautiful female magic users — the Trinity Seven.
Trinity Seven - watch online: streaming, buy or rent
Currently you are able to watch "Trinity Seven" streaming on HiDive or for free with ads on Crunchyroll.