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A girl named, Riko and her robot friend, Reg, journey down into a deadly, otherworldly chasm, known as the Abyss, in search of her lost mother

In 2045, two children born on the moon and three kids from Earth try to survive after an accident on their space station leaves them stranded

When three gifted kids at an isolated idyllic orphanage discover the secret and sinister purpose they were raised for, they look for a way to escape from their evil caretaker and lead the other children in a risky escape plan

Riko, Reg, and their new friend, Nanachi, continue their journey down the Abyss and arrive at the 5th layer But in order for them to continue to the 6th layer, they must encounter the haunting figure of Nanachis past Bondrewd the