Portal:Anime and manga/Anniversaries/January/January 20
Manga serialization
- 2004 – Mugen Spiral by Mizuho Kusanagi begins serialization in Hana to Yume
- 2006 – Densha Otoko by Hitori Nakano finishes serialization in Weekly Shōnen Champion
Television series and specials
- 2000 – Now and Then, Here and There finishes airing on WOWOW
- 2004 – Kita e: Diamond Daydreams begins airing on AT-X