Magical Girl Lyrical Nanoha

Riot Force 6's Day Off (Second Part) (3x11)

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Nanoha, Fate, Shamal, Teana, and Subaru come to aid Caro and Eriol. Eriol, Caro, Teana, and Subaru go down the sewer to investigate. They meet up with Subaru's sister, Ginga, but things take a turn or the worse.