- orange - Tome 3 (VF)
- orange - Tome 4 (VF)
- Orient Volume 1
- Orient Volume 2
- Orient Volume 3
- Orient Volume 4
- Orion
- Otaku and the Struggle for Imagination in Japan
- Othello
- Otherside Picnic: Volume 1
- Otherside Picnic: Volume 2
- Otherside Picnic: Volume 3
- Otome Mania!! Vol. 1
- Otome Mania!! Vol. 2
- OTORIMONOGATARI
- Our Dining Table
- Our Fake Marriage Volume 1
- Our Fake Marriage Volume 2
- 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 Precious Conversations Volume 1
- Our Precious Conversations Volume 2
- Our Precious Conversations Volume 4
- Our Precious Conversations Volume 5
- Our Wonderful Days Vol. 1
- Our Wonderful Days Vol. 2
- Our Wonderful Days Vol. 3
- Outbreak Company: Volume 10
- Outbreak Company: Volume 11
- Outbreak Company: Volume 12
- Outer Ragna: Volume 1
- Outer Ragna: Volume 2
- OVERLORD (10)
- OVERLORD (8)
- OVERLORD (9)
- Overlord à la Carte, Vol. 1
- Overlord à la Carte, Vol. 2
- Overlord à la Carte, Vol. 3
- OVERLORD 不死者之Oh! (1)
- OVERLORD 不死者之Oh! (2)
- OVERLORD 不死者之Oh! (3)
- Overlord, Vol. 10 (manga)
- Overlord, Vol. 11 (manga)
- Overlord, Vol. 12 (manga)
- Overlord, Vol. 2 (manga)
- Overlord, Vol. 4 (manga)
- Overlord, Vol. 5 (manga)
- Overlord, Vol. 6 (manga)
- Overlord, Vol. 7 (manga)
- Overlord, Vol. 8 (manga)
- Overlord, Vol. 9 (manga)
- Overlord: The Undead King Oh!, Vol. 1
- Overlord: The Undead King Oh!, Vol. 2
- Overlord: The Undead King Oh!, Vol. 3
- Overlord: The Undead King Oh!, Vol. 4
- Overlord: The Undead King Oh!, Vol. 5
- OVERLORD官方漫畫精選集 (1)
- OVERLORD官方漫畫精選集 (2)
- OVERTAKE! ~Pink EV-F1 Racers~