Season 2 is identified as Season 7. Why?

Plex DocumentationYour MediaNaming & Organizing Your TV Show Files

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You need to rename your files according to Plex requirements. See the support documents linked above.

Which folder is added to the Plex TV show library?
What is the directory name after “Animation”? The one in square brackets?
Plex does not support subfolders between the folder added to the library and the show folder.

Also, the naming for the show folder, Inuyasha (2002-2004), and the individual episodes, Inuyasha {S02.E01} (Capitulo 028), is incorrect.

After renaming & reorganizing, Plex Dance the entire series.

Example:

x:\Series\Animation <-- "Animation" is folder added to Plex library, not "Series." 
                        "Series" cannot be added to any Plex library.  
                        Also, remove the directory in square brackets after "Animation."
...\Inuyasha (2000) {tvdb-71361} <-- show_name (year), TVDB ID optional
......\Season 01 <-- "Season" in English, Two digits for number
.........\Inuyasha (2000) - s01e01.mkv <-- sXXeYY is mandatory and cannot be in brackets/braces.