The title's "Missing Power" refers to the which was considered "lost" or "missing" from Gensokyo since they had long ago retreated to the Underworld. "Immaterial" likely refers to Suika's ability to turn herself into a thin, intangible mist. Gameplay Context
The story of (often abbreviated as IaMP ) centers on a mysterious phenomenon where the residents of Gensokyo find themselves trapped in a cycle of endless feasts, even though the traditional cherry blossom viewing season has long passed. The Plot: "The Night Parade of One Hundred Oni" Touhou 7.5: Immaterial and Missing Power Free D...
Because the knowledge of how to properly exterminate an oni had been lost to time in Gensokyo, the heroines couldn't fully defeat her in the traditional sense. However, after being confronted, Suika's mist eventually dissipated, and the frequency of the feasts returned to normal. Meaning of the Title The title's "Missing Power" refers to the which