That day, a bright fireball passed through the earth. When human beings wake up, they find that they are surrounded by dirt, nothing but dirt. There is a ring and a digging shovel on the ground. The ring is a 3×3×3 large space ring. The digging shovel is used to dig soil. You can dig through the cellar to the next cellar. You cannot go back, you can only go straight forward. You can dig straight forward or dig forward in a curve. No one knows what lies ahead.
This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.
