Is It Wrong to Try to Pick Up Girls in a Dungeon? On the Side: Sword Oratoria, Vol. 4 (light novel)

After the tumultuous events in the Dungeon, Aiz has
finally reached the vaulted Level 6! But in spite of this amazing news, the
Sword Princess seems to be completely depressed. There are two reasons. The
first is that she finally managed to meet the white-haired boy again, but once
more, he ran away from her with everything he had. The second is that the
monster tamer she fought so hard against knew her name--a name that absolutely
no one else should know, and yet...Meanwhile, from the depths of the Dungeon
comes a mysterious crystal ball that's about to plunge both underground and
surface worlds quietly into chaos!