Action

One Hundred Thousand Years of Tribulation by Heavenly Thunder

One Piece

One Punch-Man

Onigoroshi no Gadou Saien

Only I Have an EX-Grade Summon

Only I Shall Be Immortal

Ordinary Child

Ore no Manamusume wa Akuyaku Reijou

Ore wa Kage no Eiyuu ja Arimasen!

Ori no Naka no Soloist

Otherworldly Record of the Magic Stones – Aixia’s Salvation

Ougon no Keikenchi

Ouritsu Majutsu Gakuin no Kichiku Koushi

Over Clock

Over the Top (RAZR)

Overgeared