This question straddles all three of anime, manga, and light novels, so I figured I’d just drop it in the anime community first. Though if it doesn’t belong here, feel free to delete it and I’ll go somewhere else.

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I’ve only been watching anime for a few years. This year, I’ve started reading manga and LN of some anime I’ve seen. There are a few titles where I feel like the anime adaptation was just as good and there are some where I feel like it was better. Fortunately, I haven’t encountered any cases where I think the anime completely dropped the ball, but I know there probably are some like that.

What are some titles that have huge disparities in quality between its anime adaptation and the source?