Anime that you liked at first but started hating it after reading the source material

[Star_Of_Hope]

Did it ever happen to you?

I am sure there are many such anime out there. So, do share that information here.

 

[Demon_skeith]

I guess the promise neverland fits this description.

 

[Razor1911]

Happened with return of the master. When I initially stared the manga, it was quite fun and interesting, but chapter by chapter it became boring. Ultimately I left it.