| I'm Getting Married to a Girl I Hate in My Class | January 3, 2025 | — | 12 |
| I'm Giving the Disgraced Noble Lady I Rescued a Crash Course in Naughtiness | October 4, 2023 | — | 12 |
| I'm Gonna Be An Angel! | April 7, 1999 | TV Tokyo | — |
| I'm in Love with the Villainess | October 3, 2023 | — | 12 |
| I'm Kodama Kawashiri | January 14, 2022 | Fuji Television | 24 |
| I'm Living with an Otaku NEET Kunoichi!? | January 5, 2025 | — | 24 |
| I'm Looking For a Zombie | October 3, 2026 | — | — |
| I'm Quitting Heroing | April 5, 2022 | — | 12 |
| I'm Standing on a Million Lives | October 2, 2020 | — | 12 |
| I'm the Evil Lord of an Intergalactic Empire! | April 6, 2025 | — | 12 |
| I'm the Villainess, So I'm Taming the Final Boss | October 1, 2022 | — | 12 |
| I've Been Killing Slimes for 300 Years and Maxed Out My Level | April 10, 2021 | — | 24 |
| I've Somehow Gotten Stronger When I Improved My Farm-Related Skills | October 1, 2022 | — | 12 |
| I-Chu | January 6, 2021 | — | 12 |
| Ichigo Aika | January 5, 2026 | — | 12 |
| Ichijōma Mankitsu Gurashi! | April 12, 2026 | — | 12 |
| Id – Invaded | January 5, 2020 | — | 13 |
| ID-0 | April 9, 2017 | — | 12 |
| Idaten Jump | October 1, 2005 | — | 52 |
| Idol Angel Yokoso Yoko | April 2, 1990 | TV Setouchi | 43 |
| Idol Densetsu Eriko | April 3, 1989 | TV Setouchi | 51 |
| Idol Incidents | — | — | — |
| Idol Memories | October 3, 2016 | AT-X | — |
| Idol Time PriPara | April 4, 2017 | — | — |
| Idolish7 | December 31, 2017 | — | 62 |
| Idolls! | January 8, 2021 | — | 10 |
| IDOLM@STER SideM | October 1, 2017 | — | 13 |
| Idolmaster: Xenoglossia | April 4, 2007 | — | 26 |
| Idoly Pride | January 10, 2021 | — | 12 |
| If Her Flag Breaks | April 6, 2014 | — | 13 |
| If I See You in My Dreams | December 1, 1998 | — | 16 |
| If It's for My Daughter, I'd Even Defeat a Demon Lord | July 4, 2019 | — | 12 |
| If My Favorite Pop Idol Made It to the Budokan, I Would Die | January 10, 2020 | — | 12 |
| Igano Kabamaru | October 20, 1983 | Nippon Television | 24 |
| IGPX | September 15, 2003 | — | — |
| Iii Icecrin | April 6, 2021 | — | 24 |
| Ikebukuro West Gate Park | October 6, 2020 | — | 12 |
| Ikemen Sengoku: Bromances Across Time | July 12, 2017 | — | 12 |
| Iketeru Futari | February 2, 1999 | TBS Television | 16 |
| Ikki Tousen | July 30, 2003 | — | 49 |
| Ikkyū-san | October 15, 1975 | TV Asahi | 296 |
| Ikkyū-san | April 10, 1978 | — | 26 |
| Immoral Guild | October 5, 2022 | — | 12 |
| In a World Full of Zombies I'm the Only One Who Doesn't Get Attacked | January 2027 | — | — |
| In Another World With My Smartphone | July 11, 2017 | AT-X | 24 |
| In Search of the Lost Future | October 4, 2014 | — | 12 |
| In the Beginning: The Bible Stories | November 30, 1992 | Rai 1, WOWOW | 26 |
| In the Clear Moonlit Dusk | January 11, 2026 | — | 12 |
| In the Heart of Kunoichi Tsubaki | April 10, 2022 | — | 13 |
| In the Land of Leadale | January 5, 2022 | — | 12 |
| In/Spectre | January 11, 2020 | — | 24 |
| Inakappe Taishō | October 4, 1970 | — | 104 |
| Inari, Konkon, Koi Iroha | January 15, 2014 | — | 10 |
| Inazuma Delivery | December 8, 2016 | — | — |
| Inazuma Eleven | October 5, 2008 | TV Tokyo | 127 |
| Inazuma Eleven Go | May 4, 2011 | TV Tokyo | 141 |
| Inazuma Eleven GO: Chrono Stone | — | — | — |
| Inazuma Eleven GO: Galaxy | — | — | — |
| Inazuma Eleven: Ares | April 6, 2018 | TX Network | 26 |
| Inexpressive Kashiwada and Expressive Oota | October 4, 2025 | — | 12 |