OBeyblade

OThe Aristocrat's Otherworldly Adventure: Serving Gods Who Go Too Far

OSazanami Sōshi ni Shojo o Sasagu ~Saa, Jikkuri Ai Demashō ka~

OTōsōchū: The Great Mission

ODuel Masters

ODangers in My Heart

OMix: Meisei Story

OHell's Paradise: Jigokuraku

OHeavenly Delusion

ORakudai Majo

OA Boy Meets Rocketman