Ep. 11: Riot Force 6's Day Off Part 2

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Nanoha, Fate, Shamal, Teana, and Subaru arrive to assist Caro and Erio. The group descends into the sewer system to conduct an investigation. During this operation, they encounter Ginga, who is Subaru's sister. The situation deteriorates rapidly when Lutecia launches an assault within the sewers. She is accompanied by a formidable insect creature named Garyu, which poses a significant threat to the team as they navigate the underground environment.