| The Insipid Prince's Furtive Grab for The Throne | July 6, 2026 | — | 12 |
| The Invisible Man and His Soon-to-Be Wife | January 8, 2026 | — | 12 |
| The Irregular at Magic High School | April 6, 2014 | — | 26 |
| The Irresponsible Captain Tylor | January 25, 1993 | TV Tokyo | 36 |
| The Journey Home | July 8, 2018 | Tokyo MX, KBS 2TV | 26 |
| The Jungle Book | October 2, 1989 | Fuji Television | 52 |
| The Kabocha Wine | July 5, 1982 | — | 95 |
| The Kawai Complex Guide to Manors and Hostel Behavior | April 3, 2014 | TBS Television | 12 |
| The Kept Man of the Princess Knight | January 2027 | — | — |
| The Kindaichi Case Files | April 7, 1997 | — | 148 |
| The Kindaichi Case Files R | April 5, 2014 | Yomiuri Telecasting Corporation | 47 |
| The King Kong Show | September 10, 1966 | American Broadcasting Company | 25 |
| The King of Braves GaoGaiGar | February 1, 1997 | — | 49 |
| The King of Braves GaoGaiGar Final | — | — | — |
| The Kingdoms of Ruin | October 7, 2023 | — | 12 |
| The Klutzy Class Monitor and the Girl with the Short Skirt | April 6, 2026 | — | 12 |
| The Knight in the Area | January 7, 2012 | TV Asahi | 37 |
| The Laid-Off Cheat-Granting Mage Enjoys a Second Lease on Life | October 7, 2026 | — | — |
| The Laughing Salesman | October 10, 1989 | — | — |
| The Law of Ueki | April 4, 2005 | TV Tokyo | 51 |
| The Legend of Condor Hero | October 11, 2001 | — | — |
| The Legend of Heroes: Trails in the Sky | October 10, 2011 | — | 2 |
| The Legend of Heroes: Trails of Cold Steel – Northern War | January 6, 2023 | — | 12 |
| The Legend of Snow White | April 6, 1994 | NHK Satellite 2 Television | 52 |
| The Legend of the Legendary Heroes | July 1, 2010 | TV Tokyo | 24 |
| The Legend of Zorro | April 5, 1996 | NHK Satellite 2 Television | 52 |
| The Legendary Hero Is Dead! | April 7, 2023 | — | 12 |
| The Littl' Bits | 1980 | TV Tokyo | 26 |
| The Lonely Snow Widow and the Cursed Ring | October 5, 2026 | — | — |
| The Long Summer of August 31st | — | — | — |
| The Lost Village | April 2, 2016 | — | 12 |
| The Magic of Chocolate | March 3, 2011 | — | 13 |
| The Magical Girl and the Evil Lieutenant Used to Be Archenemies | July 9, 2024 | — | 12 |
| The Magical Revolution of the Reincarnated Princess and the Genius Young Lady | January 4, 2023 | — | 12 |
| The Magnificent Kotobuki | January 13, 2019 | — | 12 |
| The Maid I Hired Recently Is Mysterious | July 23, 2022 | — | 11 |
| The Many Sides of Voice Actor Radio | April 10, 2024 | — | 12 |
| The Marginal Service | April 12, 2023 | — | 12 |
| The Marshmallow Times | April 4, 2004 | TV Tokyo | 52 |
| The Master of Ragnarok & Blesser of Einherjar | July 8, 2018 | — | 12 |
| The Masterful Cat Is Depressed Again Today | July 8, 2023 | MBS TV | 13 |
| The Melancholy of Haruhi Suzumiya | April 3, 2006 | — | 28 |
| The Millionaire Detective - Balance: Unlimited | April 10, 2020 | Fuji Television | 11 |
| The Misfit of Demon King Academy | July 4, 2020 | — | 25 |
| The Mononoke Lecture Logs of Chuzenji-sensei | April 7, 2025 | — | 12 |
| The Moon on a Rainy Night | 2027 | — | — |
| The Morose Mononokean | June 28, 2016 | — | 26 |
| The Most Heretical Last Boss Queen | July 7, 2023 | — | 12 |
| The Most Notorious "Talker" Runs the World's Greatest Clan | October 7, 2024 | — | 12 |
| The Mysterious Cities of Gold | June 29, 1982 | NHK General TV | 26 |
| The Mystic Archives of Dantalian | July 16, 2011 | — | 12 |
| The Mythical Detective Loki Ragnarok | April 5, 2003 | TV Tokyo | 26 |
| The New Adventures of Gigantor | October 3, 1980 | Nippon Television | 51 |
| The New Adventures of Kimba The White Lion | October 12, 1989 | TV Tokyo | — |
| The New Gate | April 14, 2024 | — | 12 |
| The Oblivious Saint Can't Contain Her Power | June 30, 2026 | — | 12 |
| The Ogre's Bride | July 5, 2026 | — | 12 |
| The One Piece | February 2027 | — | — |
| The Ones Within | July 7, 2019 | — | 12 |
| The Orbital Children | — | — | 6 |