World's End Harem Fantasia Academy is a Manga/Manhwa/Manhua in (English/Raw) language, Seinen series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

Introducing a 4-koma spin-off to celebrate the 2nd anniversary of the Shuumatsu no Harem Fantasia series. Arc and Aurelia vowed to attend the same highschool, but only Aurelia passed the test. Arc ended up entering a former girls' academy! What battles await for Arc in this school life…?