If the subject covers multiple chapters or volumes then use the latest example you're aware of. The Source of the spoiler must be in the title whenever possible.
When Posting: Posts must receive the corresponding flair (Web Novel, Light Novel, Manga, Spin-off Manga, Anime or Spin-off Anime). TenSura Nikki will from now on be considered spoilers as it is getting an anime adaptation.
In general: Any content past the Anime will be considered spoilers.