While delving into the upper layers of the Abyss to search for relics, Riko and her partner Nat become separated. Riko then sees Nat about to be eaten by a crimson splitjaw and draws the beast's attention in order to save him. However, Riko gets cornered by the splitjaw and is about to be devoured when it is suddenly chased off by a powerful energy blast. Riko traces the source of the blast back to a robot boy who has fallen unconscious, and she and Nat carry him back their home at the Belchero Orphanage. With the help of her friends, Riko is able to revive the robot boy, who she names Reg. She then takes him outside to show him the town of Orth, which sits on top of the Abyss.