in Gensokyo, the sky becomes covered in red mist, blocking out the sun in the middle of summertime, which becomes known as the Scarlet Mist Incident (紅霧異変). Reimu Hakurei becomes determined to find the cause of the red mist, as if left alone, the mist would spread across Gensokyo's border to the human world. Marisa Kirisame hopes that the person responsible for the mist would have some interesting items to collect.

Touhou Koumakyou: 東方紅魔郷

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