If you have a specific link to the content you are referring to, or if you can confirm if this is a comic or a video, I can try to help you find more specific details about the creator or the plot points!
The sound of the abacus wasn't just noise. It was a frequency. Reimu tried to focus on the Yin-Yang orbs, but the rhythm— Kei-Kei-Kei —began to sync with her heartbeat. The Fog Sets In
Given the highly specific nature of this title, which appears to be a continuation or "final" version of a fan-made story combining brainwashing themes with a "loan" (kei/kei/kei) plotline, this article will explore the context, themes, and community reception of such content.