The "-Kei kei kei loan-" part might refer to specific elements within the story, possibly related to a form of mind control, financial manipulation, or another plot device integral to the narrative. "Kei" can have various meanings in Japanese, including "system," "form," or as a suffix implying a type or manner. The repetition and the context suggest it could be a term used within the Touhou universe to describe a method, a state, or an effect related to brainwashing or mind control.
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