Dead School

What is after death? It's a question everyone asks once in their life. The truth is when someone dies they see what they want to see. Whether it hell and heaven, the underworld, or just endless void. However, when someone is worthy, they are given a choice. Continue on in death or train and fight the monsters unseen by the living. What will happen when a normal teen named Kiel is offered this choice? Can he handle it if he chooses to fight? Or will he fall into the void?