The key to save the world is friendship. Everyone wishes for this. In this world, science has answered all questions. This narrative takes place in Oshima. Akane Isshiki, 14, had a joyful, carefree life with her dependable little sister, Momo, who did all the housekeeping, and her grandfather, Kenjirou, a great inventor who only made worthless things. When the weather is clear, they can see Blue Island, a manmade island across the water. The breakthrough Manifestation Engine, a discovery that addressed the world's energy concerns, rises in the midst of the island.