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Nobody returns from the lower levels of the Abyss. Not even the brave dive explorers who explore this incredible abyss, the origin of which no one understands. Rico's mother can't get to the surface, and she barely manages to pass the news to her daughter. They have to meet. Rico has to come down.

The girl herself dreamed of becoming a diver, but it seemed so far away and almost unreal until she met Reg, a robot who looks so much like a human boy. Reg has incredible powers that he can't explain, and he wants to understand where they came from. Together they can descend into the Abyss and find Rico's mum, and maybe some answers.

As they begin to descend into the Abyss, they notice a shadow following them... what and who is waiting for them down there?