The Hinata Inn girls and Keitaro go to the beach to help run the Hinata Tea House there in order to earn extra money for the inn.  Kentaro and Keitaro's friends Masayuki and Kimiaki come along to help also.  The gang put on a play in order to draw customers but a little "help" from Kaolla causes them to have to relocate.  Seta, who was on another dig nearby,  shows up and has found an ancient theater where they continue the play.  Eventaully things spiral out of hand and Seta and Keitaro wind up duelling for Naru.