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In the far future, humans abandon the devastated Earth and move to the upper world "Tenjo". But Tenjo and the law of causation collapse by a war and humans returns to the Earth, which has turns into an inhabitable planet except for Shinshu area.

Clannad is set in a high-school located in a town in Japan, which one isn't really specified. Okazaki Tomoya is a third-year student who doesn't take his studies seriously.