A 'spoiler' is a piece of information in an article or a image about a narrative work (such as a book, feature film, television show or video game) that reveals plot events or twists, and thus may "spoil" the experience for any reader who learns details of the plot in this way rather than in the work itself.
This tag is very suggestive so please only use it for submissions on recent updates for mangas/animes that have major events.Not everything is a spoiler.After some time,the tag will eventually be removed.