"Eastern Skies of Scarlet Perceptions") is the second versus fighting game in the Touhou Project, and is the spiritual successor to Immaterial and Missing Power by Twilight Frontier and Team Shanghai Alice.

System Cards include bombs (like in Immaterial, knocks the enemy back), weather change, and other miscellaneous options.

In the middle of summer, untimely rain and hail fall in the Forest of Magic, snow blankets Hakugyokurou, the Scarlet Devil Mansion is enveloped in a cloudy, dense haze, and the Hakurei Shrine is levelled by a sudden earthquake.

Wielding the power to control the earth and the divine Sword of Scarlet Thought (緋想の剣, Hisō no Tsurugi), the jaded celestial decides to instigate a catastrophe of her own.

Like with Immaterial and Missing Power, ZUN of Team Shanghai Alice only did parts of the game while Twilight Frontier did most of the game-making.

ZUN, besides overseeing the whole development, also provided the storyline, new character designs, spell card names, and three new music tracks for the game.

[2] A trial version was sold at the Comiket 72 on August 17 of the same year for 100 yen, and a new demo was offered for free download on the Twilight Frontier's website on April 29, 2008.

Twilight Frontier also made "Hisouten Furoku ~Weatherlight~" (緋想天符録　～WEATHER LIGHT～), turning in-game cards into paper, first sold in the COMIC1☆3 convention on April 26, 2009.