Portal:Anime and manga/Anniversaries/December/December 31

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