Alternatively 地獄で日々/ Jigoku de Hibi.
Shin Kamijou is a student in his last year of high school, enjoying his everyday life that he spends with his six friends in their Tabletop RPG and otaku centered club. On a fateful day a disaster changes Shin's life into an apocalyptic hell. Join Shin as he shapes his reality and self in the apocalypse while fighting to survive. Will Shin be able to take back the everyday life he cherished back?

I never finished this, this is an archive of what I did write.