| Kaiketsu Zorori | February 1, 2004 | — | 52 |
| Kaina of the Great Snow Sea | January 12, 2023 | Fuji Television | 11 |
| Kakegurui | July 1, 2017 | — | 24 |
| Kakuriyo: Bed & Breakfast for Spirits | April 2, 2018 | — | 26 |
| Kakushigoto | April 2, 2020 | — | 12 |
| Kakyuusei 2 | — | — | — |
| Kakyūsei | July 2, 1999 | — | 13 |
| Kakyūsei 2 | October 2, 2004 | — | 13 |
| Kaleido Star | April 4, 2003 | TV Tokyo | 51 |
| Kamen no Maid Guy | April 5, 2008 | — | 12 |
| Kamen no Ninja Akakage | October 13, 1987 | Nippon Television | 23 |
| Kamichama Karin | April 6, 2007 | TV Tokyo | 26 |
| Kamichu! | June 29, 2005 | TV Asahi | — |
| KamiErabi GOD.app | October 5, 2023 | — | — |
| Kamigami no Asobi | April 5, 2014 | — | 12 |
| KamiKatsu | April 6, 2023 | — | 12 |
| Kamisama Dolls | July 6, 2011 | — | 13 |
| Kamisama Kazoku | May 18, 2006 | — | 13 |
| Kamisama Kiss | October 1, 2012 | — | 25 |
| Kamisama Minarai: Himitsu no Cocotama | October 1, 2015 | — | — |
| Kamitsubaki City Under Construction | July 3, 2025 | — | 13 |
| Kamui the Ninja | April 6, 1969 | Fuji Television | 26 |
| Kamui: He's Behind You | July 4, 2026 | — | 12 |
| Kanamemo | June 5, 2009 | TV Tokyo | 13 |
| Kandagawa Jet Girls | October 8, 2019 | AT-X | 12 |
| Kannagi: Crazy Shrine Maidens | October 4, 2008 | — | 13 |
| Kannazuki no Miko | October 1, 2004 | — | 12 |
| Kanojo no Tomodachi | October 5, 2026 | — | — |
| Kanokon | April 5, 2008 | AT-X | 12 |
| Kanon | 2002 | Fuji Television | 13 |
| Kanon | October 5, 2006 | TBS Television | 24 |
| Kantai Collection | January 8, 2015 | Tokyo MX, Kyoto Broadcasting System | 20 |
| Kappa no Kaikata | October 4, 2004 | — | 26 |
| Kappamaki | March 31, 2003 | — | 130 |
| Karakuri Circus | October 11, 2018 | Tokyo MX, Nippon BS Broadcasting | 36 |
| Karaoke Senshi Mike Jirō | April 4, 1994 | NHK Satellite 2 Television | 20 |
| Karasu Tengu Kabuto | July 29, 1990 | — | 39 |
| Karate Master | October 3, 1973 | — | 47 |
| Kare Kano | October 2, 1998 | TV Tokyo | 26 |
| Karin | November 4, 2005 | WOWOW | 24 |
| Karl to Fushigi na Tō | October 8, 2010 | Kids Station | 26 |
| Karneval | April 3, 2013 | — | 13 |
| Kashimashi: Girl Meets Girl | January 11, 2006 | — | 12 |
| Kasumin | October 13, 2001 | NHK Educational TV | — |
| Katana Maidens: Toji No Miko | January 5, 2018 | — | 24 |
| Katanagatari | January 26, 2010 | — | 12 |
| Katri, Girl of the Meadows | January 8, 1984 | — | 49 |
| Katsugeki! Touken Ranbu | July 2, 2017 | — | — |
| Kawagoe Boys Sing | October 9, 2023 | — | — |
| Kaya-chan Isn't Scary | January 11, 2026 | — | — |
| Kaze no Shōjo Emily | April 7, 2007 | NHK Educational TV | 26 |
| Kaze no Stigma | April 12, 2007 | — | 24 |
| Kaze no Yojimbo | October 2, 2001 | — | 25 |
| Keep Your Hands Off Eizouken! | January 5, 2020 | NHK General TV | 12 |
| Keijo!!!!!!!! | October 6, 2016 | — | 12 |
| Kekkaishi | October 16, 2006 | Cartoon Network, Nippon Television | 52 |
| Kemeko Deluxe! | October 4, 2008 | — | 12 |
| Kemono Friends | January 11, 2017 | TV Tokyo | — |
| Kemono Friends 2 | January 15, 2019 | TV Tokyo | 12 |
| Kemono Jihen | January 10, 2021 | — | 12 |