As the Tropical Club make preparations to cheer on the school's softball team, Minori and Laura accidentally get sucked into the latter's jar. When the two emerge, they discover that they have swapped bodies, though their friends only notice the change when they head out to greet them. Meanwhile, Minori and Laura discover each others' experiences as a mermaid and a human respectively. When their friends discover their switchover, everyone discusses the situation with Minori bringing Laura home with her for the night...