- Oasis of the Heart
- Occupation: Casanova
- Of Royal Blood
- Oh-So-Sensible Secretary
- Oku-san’s Daily Fantasies
- OLグラフィティ(1)
- OLグラフィティ(2)
- OLグラフィティ(3)
- OLグラフィティ(4)
- On His Honor
- On The Way To A Wedding...
- Once A Ferrara Wife...
- Once Burned
- Once Pregnant, Twice Shy
- One Bride Too Many
- One Hot Texan
- One Knight in Venice 1
- One Knight in Venice 2
- One Night With His Wife
- One Night With The Forbidden Princess
- One Night With The Rebel Billionaire
- One Night With The Tycoon
- One Night…Nine-Month Scandal
- One Step Ahead 1
- One Step Ahead 2
- One Summer in Italy
- One Week Friends, Vol. 1
- One Week Friends, Vol. 2
- One Week Friends, Vol. 3
- One Week Friends, Vol. 4
- One Week Friends, Vol. 5
- One Week Friends, Vol. 6
- One Week Friends, Vol. 7
- One Wild Weekend
- One-Man Woman
- One-Night Pregnancy
- Only by Chance
- OPEN SESAME 1
- OPEN SESAME 10
- OPEN SESAME 11
- OPEN SESAME 12
- OPEN SESAME 13
- OPEN SESAME 14
- OPEN SESAME 15
- OPEN SESAME 16
- OPEN SESAME 17
- OPEN SESAME 18
- OPEN SESAME 19
- OPEN SESAME 2
- OPEN SESAME 20
- OPEN SESAME 3
- OPEN SESAME 4
- OPEN SESAME 5
- OPEN SESAME 6
- OPEN SESAME 7
- OPEN SESAME 8
- OPEN SESAME 9
- Operation:Monarch
- orange - Tome 3 (VF)
- orange - Tome 4 (VF)
- Ordinary Girl In A Tiara
- Ordinary Girl, Society Groom
- Oreimo Comic Anthology
- Oreimo Volume 1
- Oreimo Volume 2
- Oreimo Volume 3
- Oreimo Volume 4
- Oreimo: Kuroneko Volume 1
- Oreimo Volume 4
- Oreimo: Kuroneko Volume 1
- Oreimo: Kuroneko Volume 2
- Oreimo: Kuroneko Volume 3
- Oreimo: Kuroneko Volume 4
- Oreimo: Kuroneko Volume 5
- Oreimo: Kuroneko Volume 6
- Otherside Picnic 01 (Manga)
- Otherside Picnic 02 (Manga)
- Otherside Picnic 03 (Manga)
- Otomen, Vol. 1
- Otomen, Vol. 10
- Otomen, Vol. 11
- Otomen, Vol. 12
- Otomen, Vol. 13
- Otomen, Vol. 14
- Otomen, Vol. 15
- Otomen, Vol. 16
- Otomen, Vol. 17
- Otomen, Vol. 18
- Otomen, Vol. 2
- Otomen, Vol. 3
- Otomen, Vol. 4
- Otomen, Vol. 5
- Otomen, Vol. 6
- Otomen, Vol. 7
- Otomen, Vol. 8
- Otomen, Vol. 9
- Our Teachers are Dating! Vol. 1
- Our Teachers are Dating! Vol. 2
- Our Teachers are Dating! Vol. 3
- Ouran High School Host Club, Vol. 1
- Ouran High School Host Club, Vol. 10