@Anon she's a model so it's literally her job to keep herself in the best possible shape. I can almost guarantee that you don't have PTSD, and the fact that you are using all of those buzz words tells me that you have pronouns in your social media bio, you have blue hair, a nose ring, and you probably drive a Subaru.
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But she's not fat though? She still skinny. It's just a little tummy? I was loving the manga so far ...