Recently dead, High Schooler Kuragari Zein is faced with a life changing situation after he makes a deal with an entity calling itself a "Sublight". He will soon be faced with decisions that will affect not only his survival but the survival of the entire human race as we know it, as many other different type of Sublights begin to appear all around the world threatening to destroy life as we know it. A new story of belonging, pain, betrayal, romance and suffering is about to begging and a new light shall be born to prevent disaster or be swallowed by darkness, in a new world were the ones to most likely stab you in the back are those whom you trust the most. The first book of a big series will now start and may the strongest Sublight survive and the weak destroyed.