Re:Zero -Starting Life In Another World- Vol. 21 (Light Novel)

The battle against the Witch Cult may be over, but it has left deep scars in the Water Gate City. In order to save those who had their name taken, Subaru and the others set off for the farthest reaches of the world. Their destination: the tower of the sage. But to get there, they must traverse the dense miasma of the Augria Sand Dunes, a den of Demon Beasts. And the key to crossing the unexplored sea of sand is the captured Demon Beast User. Together with the oni sisters who lost their memories, an artificial spirit who calls herself after a witch, and the “Greatest Knight” who has lost his name, the group takes on the Pleiades Watchtower.
Notice: This book is written in Japanese.