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kamihikokimmd

MikuMikuDance is a 3D animation program originally developed by Yu Higuchi (HiguchiM) to allow fans to create promotional videos for Vocaloid characters like Hatsune Miku. Unlike traditional frame-by-frame 2D animation, MMD uses pre-created 3D "puppets" known as models that can be posed and moved within a virtual 3D environment.

Some creators provide "flying motion" files that simulate the erratic, floating nature of paper.