Plot
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.

Drama CD cast
Yoshimasa Hosoya as Arata Kasuga
Ai Kayano as Lilith Asami
Noriko Shitaya as Arin Kannazuki
Saki Fujita as Revy Kazama
Suzuko Mimori as Mira Yamana
Yu Kobayashi as Akio Fudo-
Rumi Ookubo as Yui Kurata
Shiori Mikami as Serina Sharlock
Ayumi Fujimura as Liselotte Sharlock
Mariya Ise as Sora
Koji Yusa as Principal


Source
http://www.fujimishobo.co.jp/sp/201107trinity/
http://www.animenewsnetwork.com/news/2014-...me-in-the-works