| Infini-T Force | October 3, 2017 | — | 12 |
| Infinite Dendrogram | January 9, 2020 | — | 13 |
| Infinite Ryvius | October 6, 1999 | TV Tokyo | 26 |
| Infinite Stratos | January 7, 2011 | — | 26 |
| Ingoku Danchi | April 6, 2026 | BS11 | 12 |
| Ingress | October 18, 2018 | Fuji Television | 11 |
| Inherit the Winds | January 2027 | — | — |
| Initial D First Stage | April 19, 1998 | Fuji Television | 26 |
| Initial D Second Stage | October 15, 1999 | Fuji Television | 13 |
| Innocent Venus | July 26, 2006 | — | — |
| Insomniacs After School | April 11, 2023 | — | 13 |
| Interspecies Reviewers | January 11, 2020 | — | 12 |
| Interviews with Monster Girls | January 7, 2017 | — | 13 |
| Inu × Boku SS | January 12, 2012 | — | 12 |
| Inugami-san to Nekoyama-san | April 10, 2014 | — | 12 |
| Inukami! | April 6, 2006 | TV Tokyo | 26 |
| Inuyasha | October 16, 2000 | Nippon Television Network System | 167 |
| Inuyasha: The Final Act | October 4, 2009 | Nippon Television Network System | 26 |
| Inuyashiki | October 12, 2017 | Fuji Television | 11 |
| Invaders of the Rokujouma!? | July 11, 2014 | — | 12 |
| Invincible King Tri-Zenon | October 14, 2000 | — | 22 |
| Invincible King Trider G7 | February 2, 1980 | — | 50 |
| Invincible Steel Man Daitarn 3 | June 3, 1978 | — | 40 |
| Invincible Super Man Zambot 3 | October 8, 1977 | Nagoya Broadcasting Network | 23 |
| Ippatsu Kanta-kun | September 18, 1977 | — | 53 |
| Ippatsu Kiki Musume | October 5, 1999 | TBS Television | 16 |
| Ippon Again! | January 9, 2023 | — | 13 |
| Irina: The Vampire Cosmonaut | October 4, 2021 | — | 12 |
| Irodorimidori | January 5, 2022 | — | 8 |
| Iroduku: The World in Colors | October 6, 2018 | — | 13 |
| Iron Man | July 23, 2010 | — | — |
| Iron Wok Jan | July 5, 2026 | TV Tokyo | 12 |
| Ironfist Chinmi | July 2, 1988 | — | 20 |
| Is It Wrong to Try to Pick Up Girls in a Dungeon? | April 4, 2015 | — | 74 |
| Is the Order a Rabbit? | April 10, 2014 | — | 36 |
| Is This a Zombie? | January 11, 2011 | — | 22 |
| Isabelle of Paris | April 19, 1979 | TV Tokyo | 13 |
| Isekai Cheat Magician | July 10, 2019 | — | 12 |
| Isekai Onsen Paradise | January 12, 2024 | — | 12 |
| Isekai Quartet | April 10, 2019 | Tokyo MX | 24 |
| Ishida & Asakura | January 6, 2013 | Tokyo MX | 12 |
| Ishura | January 3, 2024 | — | 24 |
| Island | July 1, 2018 | — | 12 |
| Isuca | January 24, 2015 | — | 10 |
| Itadakiman | April 9, 1983 | Fuji Television | 20 |
| Itazura na Kiss | April 4, 2008 | — | 25 |
| Itazura Tenshi Chippo-chan | March 30, 1970 | — | 240 |
| Itsudatte Bokura no Koi wa 10 Centi Datta | November 25, 2017 | — | — |
| Itsumo Kokoro ni Taiyō o! | November 2, 1999 | TBS Television | — |
| Iwa-Kakeru! Sport Climbing Girls | October 4, 2020 | — | 12 |
| Ixion Saga DT | October 8, 2012 | — | — |
| Izetta: The Last Witch | October 1, 2016 | — | 12 |
| Izumo: Takeki Tsurugi no Senki | April 3, 2005 | TV Aichi | 12 |
| Jaadugar: A Witch in Mongolia | July 4, 2026 | TV Asahi | 12 |
| Jack-of-All-Trades, Party of None | January 4, 2026 | — | 12 |
| Jam the HOUSENAIL | — | — | 15 |
| Jarinko Chie | October 3, 1981 | — | 64 |
| Jeanie with the Light Brown Hair | October 15, 1992 | — | 52 |
| Jellyfish Can't Swim in the Night | April 7, 2024 | — | 12 |
| Jetter Mars | February 3, 1977 | — | 27 |