Koyuki and Konatsu, each lonely in her own way, are the only two members of the Nanahama High School Aquarium Club. As they spend time together, they discover that they are increasingly drawn to each other. When they go to the town summer festival together, Konatsu is finally able to ask why Koyuki spoke to her that first day at the aquarium open house. But Koyuki doesn't have an easy answer, and her stumbling reply makes the mood uncomfortable. Will this new awkwardness force a distance between them?