Headscratchers / The Fruit of Grisaia

• Why did some of Amane's classmates accuse her of commuting cannibalism? Didn't she mention in the tabloids about witnessing it?
• How was Sakashita's father able to acquire a rifle? It makes sense Yuuji was able to acquire one for his job, but why him?
• How did Amane's PTSD play a role in her getting held back? That's what I don't understand.

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