'I' am a failed person. After experiencing all the misery in the world, I am determined to be reincarnated. Everything is fine as long as I am not a human being. 'I' thought that the bad things I did during my lifetime were enough to send 'I' to hell and be reborn as sand, but somehow they all turned out to be good things.
They didn't let me become an adult, so they let me experience their life...