- Otomen 4
- Otomen 5
- Otomen 6
- Otomen 7
- Otomen 8
- Otomen 9
- OTORIMONOGATARI
- Otsbell and the Elephant Chapter 1
- Our Blood Oath, Vol. 1
- Our Blood Oath, Vol. 2
- Our Bodies, Entwining, Entwined volume 1
- Our Colors
- Our Crappy Social Game Club Is Gonna Make the Most Epic Game: Volume 1
- Our Crappy Social Game Club Is Gonna Make the Most Epic Game: Volume 2
- Our Dedication
- Our Dining Table
- Our Fake Marriage Volume 1
- Our Fake Marriage Volume 2
- Our Fake Marriage Volume 3
- Our Fake Marriage Volume 4
- Our Fake Marriage Volume 5
- Our Fake Marriage volume 6
- Our Fake Marriage volume 7
- Our Journey
- Our Last Crusade or the Rise of a New World, Vol. 1 (manga)
- Our Last Crusade or the Rise of a New World, Vol. 2 (manga)
- Our Last Crusade or the Rise of a New World, Vol. 3 (manga)
- Our Last Day
- Our Not-So-Lonely Planet Travel Guide, Volume 1
- Our Not-So-Lonely Planet Travel Guide, Volume 2
- Our Precious Conversations Volume 1
- Our Precious Conversations Volume 2
- Our Precious Conversations Volume 3
- Our Precious Conversations Volume 4
- Our Precious Conversations Volume 5
- Our Precious Conversations Volume 6
- Our Precious Conversations Volume 7
- Our Precious Conversations Volume 7
- Our Precious Conversations – Band 1
- Our Precious Conversations – Band 2
- Our Precious Conversations – Band 3
- Our Precious Conversations – Band 4
- Our Summer Holiday
- Our Teachers are Dating! Vol. 1
- Our Teachers are Dating! Vol. 2
- Our Teachers are Dating! Vol. 3
- Our Wonderful Days Vol. 1
- Our Wonderful Days Vol. 2
- Our Wonderful Days Vol. 3
- Out Of Control
- Out Of Danger
- Out Of The Blue
- Outback Boss, City Bride
- Outbreak Company: Volume 10
- Outbreak Company: Volume 11
- Outbreak Company: Volume 12
- Outcast 8
- Outer Ragna: Volume 1
- Outer Ragna: Volume 2
- Outrageous
- Outside Flower
- Ovejas atómicas
- OVERLORD (1)
- OVERLORD (10)
- OVERLORD (13)
- OVERLORD (14)
- OVERLORD (2)
- OVERLORD (3)
- OVERLORD (4)
- OVERLORD (5)
- OVERLORD (6)
- OVERLORD (7)
- OVERLORD (8)
- OVERLORD (9)
- Overlord 1
- Overlord 10
- Overlord 11
- Overlord 12
- Overlord 13
- Overlord 14
- Overlord 15
- Overlord 2
- Overlord 3
- Overlord 4
- Overlord 5
- Overlord 6
- Overlord 7
- Overlord 8
- Overlord 9
- OVERLORD Official Comic À La Carte Anthology 1
- OVERLORD Official Comic À La Carte Anthology 2
- OVERLORD Official Comic À La Carte Anthology 3
- Overlord à la Carte, Vol. 1
- Overlord à la Carte, Vol. 2
- Overlord à la Carte, Vol. 3
- Overlord – Light Novel, Band 01
- Overlord – Light Novel, Band 02
- OVERLORD 不死者之Oh! (1)
- OVERLORD 不死者之Oh! (2)
- OVERLORD 不死者之Oh! (3)
- OVERLORD 不死者之Oh! (4)
- OVERLORD 不死者之Oh! (5)
- Overlord, Vol. 10 (manga)
- Overlord, Vol. 11 (manga)
- Overlord, Vol. 12 (manga)
- Overlord, Vol. 13 (manga)
- Overlord, Vol. 14 (manga)
- Overlord, Vol. 2 (manga)
- Overlord, Vol. 4 (manga)