An ancient God called Ranga awakens on an isolated island in the South Pacific where it has been slumbering forgotten by mankind. Three sisters living in Tokyo—Minami, Ushio, and Yuuhi Shimabara—discover they have inherited this Island Kingdom, along with the huge God. When Ranga shows up in Tokyo, it soon becomes a source of wonder and conflict for the three sisters that control Ranga, the people who want to destroy it, and ones who want to use it.

"This is a prophecy for you, where five people will meet huge adversaries, and only you can protect everyone." Daisuke Toujima is a second-year high school student who was abducted when he was young. He was involved in a special phenomenon—Shibuya Drift—with his childhood friends Gai, Ru, Marimari, and Keisaku. They were transferred to the center of Shibuya over 300 years into the future. What's waiting for them is endless wilderness and forest, Interspersed ruin, future citizens, and "Revisions" which are huge mechanical monsters. Trampled by the monsters without understanding the situation, a girl who has the same name as the person who saved Daisuke when he was abducted, Miro, provided a mobile suit "String Puppet" and told them to save Shibuya. With separated paths, adversaries, destined prophecies, the boys, and girls are on their journey to return to their original time. (Source: MAL News)

A sequel to Aki-Sora under a new name.

Following the destruction of the magical floating device from OVA 1, the Magic Academy falls to earth, but unfortunately lands on and breaks a demon seal, releasing hundreds of ancient demons into the forest around the academy. The teachers are barely keeping the demons away and are desperately searching for the pieces of the floating device, so to earn more magic stones, all of the students from Amelia's class decide to leave the academy (even though they were told not to) to find the missing pieces.