シオン

A mysterious woman adventurer that Kazuto meets in town. She casts charm magic on Kazuto, trying to investigate the Dungeon. However, when she learns of Kazuto's true role in the Dungeon, and the presence of Karin, she stops and tries to distance herself. She has a daughter named Riri that she cares for greatly.

A researcher from the Heavenly Realm. Her research was considered dangerous, and she fled to the Human Realm with her daughter Riri. When the shooting star (Touka) crashed near the Dungeon, she recognized Celestial energy and was investigating out of fear that it was someone pursuing her.