Himeno goes to an archery meet with her underclassman, Ayaka Wakamaki, who acts strict towards her. Following some advice on her friends, Himeno helps Ayaka to loosen up by offering to go on a date with her. Later, the mermaid school holds a festival in which one of the mermaids has to perform a song to appease the god Tagon. The festival is interrupted, however, when a large fish monster posing as Tagon appears.