Shinogi and Moroha Minagi request that the Astral members return a funadama they found to a shrine on a beach. When Itsuki and Kuroha attempt to return it, they are sucked into the past due to the magical pollution in the area. They meet a fisherman, HyÅdÅ, who explains that he has been attempting to find a mermaid due to the miraculous healing abilities their flesh gives when it is consumed. In the present, Honami, Adelicia, Mikan, and Nekoyashiki are told the legend of the mermaids from an old woman, who recounts that mermaids return to eat those that consumed them...