This topic appears to be a specific niche query related to , a free 3D animation software, and KAF , a popular virtual singer (Vocaloid/CeVIO) often featured in MMD works. "Kamihikoki" (paper plane) is likely a reference to a specific song or creative theme.
Ongoing
The first step in your animation journey is acquiring the model. In the MMD community, the "readme" is law. Here are the standard places to find a Kafka model for free: new job for kafk kamihikoki mmd 3dcg animat free