The Cat's Tail
"God, please. If you are real, make my one last wish come true. Let me live."
When Callisto got diagnosed with an incurable genetic disorder at age 5, she was expected to live for only ten more years.
With her life on its last leg, Callisto underwent an operation that has a one in a million chance of success called the Mutated DNA Fusion, granting her wish to live. However, the operation gave her more than what she wished for.
With her black hair turned silver, cat ears overhead, and a tail from her behind, Callisto now has to live her life as a half-human and half-animal, a catgirl.