Haigakura: The Thunder Dance

After embarking on their mission, Ichiyo and Tenko drift to a small island in Okinawa where they meet a local boy, Ryu, who invites them to stay at his house where he lives with his sister, a globe-trotting photographer. Upon returning home however, she tries to kick them out and reveals she has no younger brother! Meanwhile, a storm looms over the island and Ryu has disappeared...