Acid Mana is in fact Anam from 0-zero a manga by the same author Kaneshiro Muneyuki and artistFujimura Akeji. you may verify this by there appearance as well as the age difference between her and her brother Kami, being 11 years and 146000000063 days a total of around 400 million years, which Kami confirms in ch 91 of season two. She is practically a god and the one who not only created this earth as well as several others, she was the one who gave Kamimara his tomfoolery.