Slap Up Party: Arad Senki

Also known as:  Dungeon & Fighter

Slap Up Party: Arad Senki is the anime adaptation of Dungeon & Fighter, some random Korean MMO known in Japan as Arad Senki. The story takes place after "the cursed light of Kazan" has fallen upon the continent of Arad. The ghost knight Baron vows to unravel the secret of the curse that has possessed one of his arms, and a motley assortment of characters joins him on his quest. The predictably generic anime series was produced by Gonzo, and initially aired in Japan and Korea during 2009.

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Producers, official website and other details: AniDB, ANN, Wiki