- O Maidens In Your Savage Season Volume 1
- O Maidens In Your Savage Season Volume 2
- O Maidens In Your Savage Season Volume 3
- O Maidens In Your Savage Season Volume 4
- O Maidens in Your Savage Season Volume 5
- O Maidens In Your Savage Season Volume 6
- O Maidens In Your Savage Season Volume 7
- O Maidens In Your Savage Season Volume 8
- O Parque à Meia-Noite
- O Recruta Endi
- O Regresso de Jaspion
- O Tempo com Você vol. 01
- O Tempo com Você vol. 02
- O Tempo com Você vol. 03
- O-Parts Hunter, Vol. 12
- O-Parts Hunter, Vol. 9
- Obsessions of an Otome Gamer Volume 2
- Ocean of Secrets - Band 1
- Ocean of Secrets - Band 2
- ODA CINNAMON NOBUNAGA Volume 1
- ODA CINNAMON NOBUNAGA Volume 2
- ODA CINNAMON NOBUNAGA Volume 3
- ODA CINNAMON NOBUNAGA Volume 4
- Odd Is on Our Side (Graphic Novel)
- Odd is on Our Side (Odd Thomas graphic novel)
- Ode to Kirihito
- Of Dragons and Fae: Is a Fairy Tale Ending Possible for the Princess’s Hairstylist?
- Of the Red, the Light, and the Ayakashi, Vol. 10
- Of the Red, the Light, and the Ayakashi, Vol. 6
- Of the Red, the Light, and the Ayakashi, Vol. 7
- Of the Red, the Light, and the Ayakashi, Vol. 8
- Of the Red, the Light, and the Ayakashi, Vol. 9
- Of Thieves and Elves: Volume 2