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Requesting a Generic anime Girl Transforming into a Shellos.
Start with her melting a little bit and looking a bit worried. Then show drastic changes like antennas sprouting and limbs withdrawing and her looking more confident now she knows what's going on. After the transformation is complete, have the Shellos look at herself and show a happy smile, followed by her squeezing into a tiny crack in a wall.
Thanks to anyone who gives this a shot!
PS: Make the Shellos large but not giant.
