During a peaceful summer in Gensokyo, an unnatural scarlet mist appears without warning and covers much of the land. It is strong enough to block out the sun, causing the affected areas to become dark and cold.

How long is Touhou Koumakyou ~ The Embodiment of Scarlet Devil?
When focusing on the main objectives, Touhou Koumakyou ~ The Embodiment of Scarlet Devil is about 1½ Hours in length. If you're a gamer that strives to see all aspects of the game, you are likely to spend around 155 Hours to obtain 100% completion.