Also known as: 東方萃夢想, 萃夢想, IaMP
東方萃夢想 ("Touhou Suimusou") ~ Immaterial and Missing Power
("Gathering Dreams in the East")
Eighth game in the Touhou series, third in the Windows generation, and first spinoff, as well as the first fighting spinoff made in collaboration with Tasogare Frontier. Labeled as "Touhou 7.5".
An incessant occurrence of feasts began troubling residents of Gensokyo, thus only 3 days before another such feast occurs, 6 girls decide to investigate and filter out the source - a party-loving oni who hopes that the feasts finally lure her fellow oni out of centuries of hiding underground.