| Ore to Kanojo no Koi wo Chounouryoku ga Jamashiteru | Light Novel | japanese | 4.5 |
| Ore to Kawazu-san no Isekai Hourouki | Web Novel | japanese | 4.4 |
| Ore wa LV99999, Shikashi, Ore no Tokei ga 1 | Web Novel | japanese | 2.9 |
| Ore wa Mada, Honki o Dashite Inai | Web Novel | japanese | 3.1 |
| Ore wa Souseki wo Shiranai ~Itsu no Ma ni ka Kanojo ga Dekitemashita~ | Web Novel | japanese | 4.1 |
| Ore wo Suki Nano wa Omae Dake ka yo | Light Novel | japanese | 3.4 |
| Ore, Twintail ni Narimasu. | Light Novel | japanese | 3.7 |
| Oreo Tensei! | Web Novel | japanese | 4.2 |
| Oreta Seiken to Teikan no Kenki | Light Novel | japanese | 4.3 |
| Origami Masters Are Weak? Ever Heard of a 600 Trillion Explosive Talisman? | Web Novel | chinese | 3.0 |
| Original Flavor and 30% Sweet | Web Novel | chinese | 4.5 |
| Originally, I Was A Delinquent, But Now I’m A Serious Girl! | Web Novel | japanese | 3.8 |
| Origins Of Evil | Web Novel | korean | 4.1 |
| Osananajimi ga Zettai ni Makenai Love Comedy | Light Novel | japanese | 3.5 |
| Osananajimi no Imouto no Kateikyoushi wo Hajimetara Soen Datta Osananajimi ga Kowai (LN) | Light Novel | japanese | 3.9 |
| Osananajimi no Imouto no Kateikyoushi wo Hajimetara Soen Datta Osananajimi ga Kowai (WN) | Web Novel | japanese | 3.6 |
| Osananajimi to Iu Jubaku kara no Kaihou ~Boku no ga Saki ni Suki datta no ni! Shiran ga na~ | Web Novel | japanese | 2.2 |
| Osananajimi to Sekkusu-gokko o Hajimete, 10-nen ga tatta | Web Novel | japanese | 3.1 |
| Oscar | Web Novel | korean | 4.1 |
| Oshikake Inumimi Dorei ga, Neeto na Daieiyuu no Oseiwa wo suru you desu | Web Novel | japanese | 3.8 |
| Ossan (36) Ga Idol Ni Naru Hanashi | Web Novel | japanese | 4.3 |
| Ossan Boukensha no Jimichi na Isekai Tabi | Web Novel | japanese | 3.9 |
| Ostentatious Zhao Yao | Web Novel | chinese | 4.4 |
| Other People’s Rice Cakes Taste Better | Web Novel | korean | 2.9 |
| Other World Assassin Life of a Man who was a Shut-in | Web Novel | japanese | 3.5 |
| Other World Travel Diary by a Relatively Peaceful High School Student | Web Novel | japanese | 3.9 |
| Other World’s Monster Breeder | Web Novel | japanese | 3.2 |
| Otherwordly Kitty-Cat ~Reborn as a Cat~ | Web Novel | japanese | 3.3 |
| Otherworld Adventure of a Friendly Reincarnator | Web Novel | japanese | 3.2 |
| Otherworld Cheat Harem | Web Novel | korean | 3.4 |
| Otherworld Constellation Gallery | Web Novel | korean | 3.0 |
| Otherworld Dagashi Shop Yahagi | Web Novel | japanese | 3.8 |
| Otherworld Demon King Survival Guide | Web Novel | korean | 3.4 |
| Otherworld Destruction Gallery | Web Novel | korean | 3.8 |
| Otherworld Nation Founding Chronicles | Web Novel | japanese | 3.8 |
| Otherworld Reincarnation as the Peerless Exiled Villainess Sage Demon Lord Fail-skill Cheat Harem SSS-Rank – Adding All the Trends Makes You the Strongest, But the Other World is Already Slow~ | Web Novel | japanese | 2.2 |
| Otherworld TRPG Game Master | Web Novel | korean | 4.1 |
| Otherworldly Architect | Web Novel | chinese | 3.9 |
| Otherworldly Bar | Web Novel | chinese | 3.4 |
| Otherworldly Commentator: All I Wanted Was to Watch Commentary Videos in Another World, But I Ended Up With Broadcasting Gear! | Web Novel | japanese | 3.5 |
| Otherworldly Evil Monarch | Web Novel | chinese | 3.8 |
| Otherworldly Memorial ~ I Thought It Was an RPG, but It Turned Out to Be a Gal Game World, but I’m Going to Play Many Rounds and Try to Capture All the Characters! ～ | Web Novel | japanese | 3.3 |
| Otherworldly Merchant | Web Novel | chinese | 2.5 |
| Otherworldly Paradise | Web Novel | chinese | 3.4 |
| Otherworldly RV Lodge | Web Novel | chinese | 3.6 |
| Otherworldly Skeleton Evolution | Web Novel | chinese | 3.6 |
| Otherworldly Warrior with Erotic Skills | Web Novel | japanese | 2.9 |
| Otherworldly White Dragon Lord | Web Novel | chinese | 3.1 |
| Otoko Darake no Isekai Trip ~BL wa Okotowari~ | Light Novel | japanese | 4.0 |
| Otoko Nara Ikkokuichijou no Aruji o Mezasa Nakya, ne? | Web Novel | japanese | 3.5 |