A lipsync model made by Catlione
The dolls are removable and there are extra frames for sadness, anger, etc.

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Scroll down until you see the one labeled "Myuto Amaya"!
Picture
MMD model and video/cover by Razzpixel!

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Pass hint: 英語でスペースなし：[幸せシンセサイザー]
Custom MMD Model by Yoistyle.

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[Not Amaya singing]