Valkyrie Choukyou Semen Tank no Ikusa Otome 10-nin Shimai
Japanese title: ワルキューレ調教・ザーメンタンクの戦乙女10人姉妹
Type: OVA
Source: Visual novel
Episodes: 2
Status: Finished Airing
Aired: Dec 21, 2009 to Mar 26, 2010
Duration: 28 min per ep
Rating: Rx - Hentai
Studios: PoRO
Genres: Hentai

Based on erotic game by MBS Truth.

The Valkyrie are charged with maintaining peace between the realm of gods, the realm of humans and the realm of the dead. The peace has started to breakdown and one of the Valkyrie has been possessed by a vengeful force.

(Source: ANN)