Rodent People: Origins

Rodent People are rats with human level brain power and a body enhanced with bionic parts, who somehow found themselves locked up in a prison.
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At the first glance, life inside the cell is not too bad. Rats occupy themselves by working and earning money, which they can later spend on food, water and other commodities. However, despite their perfect, stress-free living conditions, Rodent People can no longer bear their boring routine and decide to break out of the prison cell and find out the mystery behind why they were incarcerated in the first place.