Board Thread:Questions and Answers/@comment-45059012-20200519204615/@comment-7428000-20200520141330

Hi Sempiternity!

To start with the simple part - the "another one" you watched a long time ago was most likely Toaru Majutsu no Index.

The watch/read order question is difficult to answer because of how vague the term "understand everything" is, but perhaps these pages can help you wrap your head around the size of this franchise and the best watch/read order for you.

Q&A from 2014 on the read order

https://toarumajutsunoindex.fandom.com/wiki/List_of_Light_Novels_and_Other_Literary_Works

https://toarumajutsunoindex.fandom.com/wiki/List_of_Manga_Series

https://toarumajutsunoindex.fandom.com/wiki/List_of_Animated_Media