Becoming foam, forever at the bottom of the sea

In the rural town of Shizuho, there was a rumor: that mermaids existed in the night sea. Minami Kokoro, who knew the true identity of that mermaid, harbored secret romantic feelings for the rumored mermaid Genchū Kurage. While carefully hiding her feelings so as not to be discovered, she would go to meet her under the pretense of delivering school printouts—such was her daily routine. But one day, news breaks that a giant meteor will collide with Earth.