A boy was given a pretty stone that was found by his father in the mining cave. It was beautiful and precious and was dear to him. One day, the boy encountered a group of bullies who tied him up to a tree and beaten him to death. The blood from the boy's body spilled into the stone on his neck and caused a massive explosion. In an instant, the boy's village was wiped off the earth, and all remains were a huge 40-km wide crater. This event the life of many people and one week after the explosion, discord erupts and danger arrives as Machi's parents had died and left the lonely girl in despair.