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Things have gone woefully wrong for Derrick. He's binge eating and his weight has spiralled. He's fallen out with his best friend. The girl he likes doesn't like him. He's in trouble at school. And if it weren't for his sister Charlotte, none of this shiznit would be happening. If Charlotte wasn't depressed, if she hadn't tried to... well, you know... everything would be fine, just like it used to be.