TL;DR – Kamisama no Iutoori

Boring highschool. Death by kids games. Gore. Blood. More gore. Gratuitous sexual references. Mild gore. Bad story telling but interesting plot. OK-ish art. Give it a shot; it's not half bad. Bonnie Genevieve Gifford January 17th 2015 With thanks to MangaFox and MangaReader for providing free scanlation manga for everyone.

Usogui

Kami-sama no Iutoori (MOEGI Yuu) Manga

Mahou Shoujo of the End (Magical Girl Apocalypse)

Kamisama no Iutoori Manga Chapter 21

Ushimitsu Kiyoshiro, Kamisama no Iutoori Wiki

Usogui

Kamisama no Iutoori Ni by LeanaMee101 on DeviantArt

Kamisama no Iutoori Manga Chapter 21

kamisama no iutoori ni ushimitsu x akashi coloring by prof-kenny

Torikago no Tsugai (Birdcage Castle)

Kami-sama no Iutoori

Read Kamisama No Iutoori Fujimura Akeji Chapter 21 - MangaFreak

TL:DR British Otaku

Kamisama no Iutoori, Volume 1: Deadly Children's Games, Gorey