Every year, beings from the supernatural world called Tsuyoi come into our world and kidnap humans - the people that go missing are all teenagers, nobody older than twenty. They bring them to labs, make them to be no longer human, give them different powers, unique, strange features. But they wanted to experiment, see how far they could go, what they could do so they picked one person, a young girl and started to experiment. They made something new, eerily strange, unnatural, something even they had never seen before. Slowly, they discover her powers, unique aspects and learn more about this new species they have created. They call her - Failed