Fantasy

One Piece

Only I Know That This World is a Game

Only Sense Online

Onnamao-sama ha Yuusha-kun wo Taosenai.

Otome Game no Heroine de Saikyou Survival

Overgeared

Overlord of Insects

Parallel Paradise

Peddler in Another World: I Can Go Back to My World Whenever I Want (Manga)

Perhaps Invincible