Maru and Shida get into a fight over Shida lying to him about the amnesia, and Maru's inability to figure out why she did it in the first place. At the same time, Kachi schemes with Kai to get ahead in the "race". At the Ultramarine Alliance, the boys suggest a trip to Okinawa to have some "summer memories"; the girls initially reject the idea of filming their swimsuits but reluctantly give in when that's axed. Due to having to watch her sisters, Shida has to come with them the following day...