A boy who has been bed sick since he was born finally reached the end of his life. Fortunately the gods decided to give him another chance and allowed him to be born into a new world. The only problem was that, he was not human! "I was only joking when i said that all I needed was a healthy body and that i didn't even need to be human OK? You didn't have to take it seriously!!" The frustrated scream of a little manta reverberated in the dark underwater world.