In this world there are massive towers that reach the clouds. Made of an unbreakable material and with an unknown origin these towers open their massive doors once every 100 years. It is unknown what happens to anyone who stays inside when the door closes. Kingdoms have started using these towers to get rid of criminals. Once the door opens they put the criminals inside and wait for the door to close. Leaving those criminals to whatever fate awaits them withing the tower. This is the same fate that will soon befall Julius, a petty thief who was captured and is forced to enter the tower. What fate waits for him inside the black tower?