Counterattack ~A ridiculous job [Custard Pudding]. But I will definitely take back Japan~

The Prime Minister is assassinated by an unidentified monster, and Japan is reduced to hell. Guided by a voice from heaven, a large number of people determined to reclaim Japan are transported to another world. There, I am given the ridiculously named, unpopular job of "Custard Pudding" and the myst...