In contrast to the main series, which is set in a generally healthy human body, Cells at Work! Code Black is set in a "black" environment of a body suffering an unhealthy lifestyle. The story follows the anthropomorphic cells struggling to maintain the body.
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Time of Life in Fairy Tail Sin and Sacrifice in Fairy Tail People and People, Dragons and Dragons, People and Dragons in Fairy Tail Zirconis' Magic in Fairy Tail 
