The main character is Ao Fukai, a 13 year old boy living on Iwado Island in Okinawa. He has a childhood friend named Naru Arata. Ao's father's whereabouts are unknown, and his mother was abducted by certain people 10 years ago. He currently lives with an old doctor on the island named Toshio. Naru is a frail child since young who cannot go without an oxygen inhalator. When Naru was very young an incident happened which awakened the power of Yuta within her. (Yuta is a sort of mystic power which is part of an actual Okinawan culture/religion.)

Apparently the story in E7AO starts when Ao accidentally discovers Nirvash and reactives it to protect the island from some sort of danger.