Magical Girl Lyrical Nanoha

Season 3, Episode 10

Episode Title: Riot Force 6's Day Off (First Part)

Air Date: 2007-06-04

Overview:

Subaru, Teana, Caro, and Erio are on their vacation. Suddenly, Erio sensed a magical presence, and follows it. To Erio and Caro's surprise, they see a girl coming out of the sewers. What was attached to that girl's foot was a relic case!