Sometimes these stages are re-distributed by Western users.
"Monstershinkaipastelroommmd1var new" refers to a specific, user-created 3D environment, typically featuring a pastel, "kawaii" aesthetic used in MikuMikuDance (MMD) or Virt-A-Mate (VaM) for animation. These custom assets are generally distributed through creative communities like DeviantArt or on the Virt-A-Mate Hub. For a similar environment, explore the Pastel Room assets on DeviantArt DeviantArt Pastel Room MMD Stage - Paid Scenes - monstershinkaipastelroommmd1var new