This is a mockumentary about Yaobikuni, women who have attained immortality by eating a mermaid. Miike is the director for a documentary show. He gives a smartphone to a Yaobikuni named Mizuki, who is living in the modern day while concealing herself, so he can stay in touch with her, and Mizuki uses it to meet other Yaobikuni women. Mizuki dresses up and goes to meet a man from a dating app, but he does not show. Miike tries to comfort Mizuki after she gets dejected, and that leads Mizuki to become attracted to Miike.