Is there anything for us to talk about now? "I shouldn’t have believed in Shiori-san." Hinako, a girl who has wished for death and lived hoping for the death that would come, and Shiori, a mermaid who deceived her in an attempt to protect her life. Shiori tries to convey her true feelings and persuade Hinako to hold back from death, but the despair that Hinako carries has already reached an irretrievable point... As Hinako, who has completely lost hope for living, struggles to survive tomorrow, what is the worst decision Shiori will make, and what is the bond that will form between them?