Akko-chan's Got a Secret! – The Sea! The Specters!! The Summer Festival 1989 ( 6)

Akko and her friends are on summer vacation, and what could be more of a summer event than a beach trip? A festival is occurring around the beach, and while everyone is enjoying the festivities, Taisho and his gang head to a supposedly cursed island. Does Akko have anything to do with it?