Fujimaru recalls his journeys in the other Singularities, particularly the regret he feels for those he couldn't save. Fujimaru finds himself questioning his decisions. Meanwhile, Gilgamesh dispatches him to investigate the city of Ur under royal orders.

Finishing up the investigation at the Persian Gulf, Fujimaru and company are given a new order from the king. The new order is to retrieve a clay tablet that Gilgamesh had previously lost in the city of Kutha. Kutha was a city that suddenly disappeared after the emergence of the three goddesses, where every citizen had passed away. In such a quiet town, the entourage decides to split up in search of the tablet. Fujimaru suddenly wanders into a very frigid world. It is what people call "the underworld," a space separate from the physical world.