| Jushin Liger | March 11, 1989 | TV Asahi, Nagoya Broadcasting Network | 43 |
| Jyu-Oh-Sei | April 13, 2006 | — | 11 |
| K.O. Beast | — | — | 7 |
| Kagaku Bōkentai Tansar 5 | July 27, 1979 | — | 34 |
| Kaiba | April 11, 2008 | WOWOW | 12 |
| Kaiju No. 8 | April 13, 2024 | — | — |
| Kashimashi: Girl Meets Girl | January 11, 2006 | — | 12 |
| Kemeko Deluxe! | October 4, 2008 | — | 12 |
| Kiddy Girl-and | October 15, 2009 | — | 24 |
| Kino's Journey | April 8, 2003 | WOWOW | 13 |
| Kino's Journey: The Beautiful World - The Animated Series | October 6, 2017 | — | 12 |
| Kiznaiver | April 9, 2016 | Tokyo MX, Gunma Television | — |
| Knights of Sidonia | April 11, 2014 | — | 24 |
| Kokoro Library | October 12, 2001 | — | 13 |
| Kurau Phantom Memory | June 24, 2004 | — | 24 |
| Kurogane Communication | October 5, 1998 | — | 24 |
| Kyōran Kazoku Nikki | April 12, 2008 | — | 26 |
| Lagrange: The Flower of Rin-ne | January 8, 2012 | — | 24 |
| Lazarus | April 6, 2025 | Animax, TV Tokyo, TX Network | 13 |
| LONA | April 2027 | — | — |
| Lost Universe | April 3, 1998 | TV Tokyo | 26 |
| Macross Delta | April 3, 2016 | Tokyo MX, Nippon BS Broadcasting | 26 |
| Macross Frontier | April 4, 2008 | — | 25 |
| Made in Abyss | July 7, 2017 | — | 13 |
| Maetel Legend | November 1, 2000 | — | 2 |
| Magical Shopping Arcade Abenobashi | April 4, 2002 | — | 13 |
| Mahoromatic | October 5, 2001 | — | 26 |
| Majestic Prince | April 4, 2013 | — | 24 |
| Mama is Just a Fourth Grade Pupil | January 10, 1992 | Nippon Television | 51 |
| Marine Boy | October 6, 1966 | Fuji Television, TBS Television | — |
| Mars Daybreak | April 1, 2004 | — | 26 |
| Martian Successor Nadesico | October 1, 1996 | TV Tokyo | 26 |
| Marvel Anime | October 1, 2010 | Animax, G4 | 48 |
| Me and the Alien MuMu | April 10, 2025 | — | 24 |
| Medabots | July 2, 1999 | — | 52 |
| MegaMan NT Warrior | March 4, 2002 | — | 209 |
| Melody of Oblivion | April 6, 2004 | — | 24 |
| Metal Armor Dragonar | February 7, 1987 | — | 48 |
| Metal Fighter Miku | July 8, 1994 | TV Tokyo | 13 |
| Metallic Rouge | January 11, 2024 | Fuji Television | 13 |
| Mighty Space Miners | November 11, 1994 | — | 2 |
| Milky Subway: The Galactic Limited Express | July 3, 2025 | Tokyo MX | — |
| Mirai Keisatsu Urashiman | January 9, 1983 | Fuji Television | 50 |
| Mirai Shounen Conan II: Taiga Adventure | October 16, 1999 | TBS Television | 24 |
| Misaki Chronicles | January 7, 2004 | — | 13 |
| Mobile Suit Gundam SEED | October 5, 2002 | MBS | 50 |
| Mobile Suit Gundam SEED Destiny | October 9, 2004 | MBS | 50 |
| Mobile Suit Gundam: Iron-Blooded Orphans | October 4, 2015 | — | 50 |
| Mobile Suit Zeta Gundam | March 2, 1985 | — | 50 |
| Mojacko | October 3, 1995 | — | — |
| Moonlight Mile | February 4, 2007 | WOWOW | 26 |
| Mutant Turtles: Superman Legend | — | — | — |
| Muteking, The Dashing Warrior | September 7, 1980 | Fuji Television | 56 |
| My Dear Marie | March 6, 1996 | — | 3 |
| My Wife Has No Emotion | July 2, 2024 | — | 12 |
| My-HiME | September 30, 2004 | TV Tokyo | 26 |
| Mīmu Iro Iro Yume no Tabi | April 3, 1983 | TBS Television | 127 |
| Mū no Hakugei | April 5, 1980 | Yomiuri Telecasting Corporation | 26 |
| Nadia: The Secret of Blue Water | April 13, 1990 | NHK General TV | 39 |
| Najica Blitz Tactics | October 5, 2001 | — | 12 |