In the far future, humans abandon the devastated Earth and move to the upper world "Tenjo". But Tenjo and the law of causation collapse from a war and humans return to the Earth, which has turned into an uni...

In this story, the seasons have changed and it will soon be the second spring. Tatsuya and Miyuki have finished their first year at first magic high school and are on their spring break. The two go to Shizuk...