Similar to 温泉幼精ハコネちゃん

Ooya-san wa Shishunki!

Kaina of the Great Snow Sea

Sweet Reincarnation

No Money (novel)

Occultic;Nine

Okitsura

Oku-sama wa Joshi Kōsei

Oku-sama wa Mahō Shōjo: Bewitched Agnes

Ogenki Clinic

Okoshiyasu, Chitose-chan

Fish in the Trap

Love Is Like a Cocktail

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

Ojamajo Doremi

Ojamanga Yamada-kun

A Girl & Her Guard Dog

Oshin