Ura-On! Episode 5. Light Music Club's Uninhabited Island Series

The girls get stranded on an island. First, Tsumugi gives some coconut juice to everyone. Second, Yui plays her guitar so that fish can be caught. The third, Azusa becomes homesick, which turns into a guessing game thanks to Ritsu of identifying pairs of legs. Finally, Azusa wants to leave the island with the other members.