Mahou Shoujo Lyrical Nanoha ViVid

Following school exams, Einhart is invited to join Vivio and the others to a special camping trip to Lutecia Alpine's residence in Carnaaji. The girls start off the trip with a swim in the river, where Einhart learns how to control her strength whilst in water. Afterwards, they have lunch, where Vivio tells Einhart about how Nove became her instructor. (Source: Wikipedia)