In 2014, the United Nations completely collapsed. The beginning of the war.
In 2015, a biological and chemical war broke out, centered on Japan.
In 2016, people who survived the war dragged their exhausted bodies and fled to the small islands in the sea; in the same year, Japan completely lost control of biological and chemical weapons and perished.
In 2017, the surviving people made their final resistance...
In fact, except that the main CP is a bit like BG, the tone is still BL~~~~There will also be various secondary CP~~~~~