Abnormal Doomsday? Have You Ever Heard of the Fourth Natural Disaster!

[The end of the world + anomalies + no heroine + no harem + the fourth natural disaster] This is an apocalyptic world... Darkness covers the sky, anomalies ravage the continent, order has been reshaped, reality distorters, thaumaturges, flesh and blood deformers... This is the end of the world for mankind. People are trying their best to get a chance to survive in this end of the world...