Portal:Anime and manga/Anniversaries/December/December 31
Manga serialization
- 1971 – Triton of the Sea by Osamu Tezuka finishes serialization in the Sankei Shimbun
Television series and specials
- 1964 – 8 Man finishes airing on TBS
- 1966 – Tetsuwan Atom finishes airing on Fuji TV
- 1972 – New Moomin finishes airing on Fuji TV
- 1978 – The Story of Perrine finishes airing on Fuji TV