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| Immaterial and Missing Power | |
|---|---|
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| Developer(s) | Twilight Frontier Team Shanghai Alice |
| Publisher(s) | Twilight Frontier Team Shanghai Alice |
| Series | Touhou Project |
| Platform(s) | Microsoft Windows |
| Release | December 30, 2004 (Comiket 67) |
| Genre(s) | Fighting game |
| Mode(s) | 1-2 players |
Touhou Suimusou ~ Immaterial and Missing Power. (Japanese: 東方萃夢想 ～ Immaterial and Missing Power., lit. "Gathering Dreams in the East"), commonly abbreviated as IaMP in English speaking circles, is a versus fighting game collaboratively developed by Twilight Frontier and Team Shanghai Alice released in 2004. It is the first spinoff in the Touhou series, and it is numbered as the 7.5th installment as the game's events place between Perfect Cherry Blossom (seventh) and Imperishable Night (eighth), although it was released after Imperishable Night. After the success of Immaterial and Missing Power, the game was followed up with Scarlet Weather Rhapsody in 2008, the first of several Touhou fighting game sequels.