"It's okay, come here—" There is a legend in this town about a mermaid that eats people. After her mother remarries, Imai Ichika moves to the town with her younger sister. Unable to accept that she has been abandoned by her mother, Ichika stubbornly refuses to adapt to the town and spends her days in resistance. During this time, she encounters a mysterious girl named "Chitose-san".... A mysterious tale created by "us, the lonely ones" begins.