Jay's Journal (Second to "Unborn to these Tests")

Jay, at the age of sixteen, got locked up in a dungeon. The young boy had killed hundreds of people after his girlfriend died. One of the many he killed was Klein Altair, a boy not much younger than him. This boy was the boyfriend to Taiyo Solar, the sun spirit.
Jay has to find out how to live off of what he had around him. When the boy is only left with the stuff in his pockets, and belongings of corpses in the dungeon, how can he live off of only that?