Kimizuka and Natsunagi are invited to Saikawa's luxury yacht due her scale difference, even though they were supposed to keep their promise to "go to the sea together". They enjoy the cruise, but Anderson, who was once Kimizuka's friend, appears. They will investigate the "legacy of Siesta", which is said to be sleeping on a passenger ship. In the evening, scary announcements start to spread on the cruise ship.