Ark is a curious and convinced boy and know as a messy guy. He always is making trouble but he calms down when he is with Elle his best friend who often take care of him and waking him every morning. Ark lives in a village called Crysta that is a underground town his dream is that one day he can see the world outside. One day he heared a voice calling for help inside of a locked door that was sealed by the Elder who takes care of the village and this door must not be open but due to personality curious of Ark he open the door and found a box with a creature inside called Yomi who was asking for help. Yomi gives a spear and he promises to take Ark to the Outside World. Ark accepts and his skills were tested on a dangerous tower. After returning to the village Elder tell to Ark that he passed on the test and he and Yomi must go to the outside World to rebuild it because the outside world was destroyed. So it begins the adventure of Ark to rebuild the real world.