Similar to おこしやす、ちとせちゃん

Occultic;Nine

Okitsura

My Wife Is the Student Council President

Oku-sama wa Joshi Kōsei

Oku-sama wa Mahō Shōjo: Bewitched Agnes

Ogenki Clinic

Fish in the Trap

Osamake

You Can't Be in a Rom-Com with Your Childhood Friends!

Ozanari Dungeon

Please Tell Me! Galko-chan

If My Favorite Pop Idol Made It to the Budokan, I Would Die

Ojisan and Marshmallow

Ojamajo Doremi

Ojamanga Yamada-kun

Ojarumaru

Oshin

Osu! Karate Club

Osomatsu-kun

Oda Cinnamon Nobunaga

The Ambition of Oda Nobuna