Harem Royale -When the Game Ends-

Ren'ai Harem Game Shuuryou no Oshirase ga kuru Koro ni (恋愛ハーレムゲーム終了のお知らせがくる頃に) is a horror harem manga series written by Ryukishi07 and illustrated by Yukari Higa.

Plot
The "academy love suspense" story is about a "love harem game" set in a real academy that was promised to a boring boy. However, in this harem scenario, the heroines will start a bloody battle.