I think that this song is simply of a siren that was captured to make "mermaid sashimi" and it is about her escape and relationship with the girl. In the beginning i guess the chefs wanted to make sure she wouldn't sing and stop then from turning her into sushi. When she got away she than sang her song and made the chefs commit suicide, themselves or by her kiss. In the end the girl and the mermaid/siren leave.
I think that this song is simply of a siren that was captured to make "mermaid sashimi" and it is about her escape and relationship with the girl. In the beginning i guess the chefs wanted to make sure she wouldn't sing and stop then from turning her into sushi. When she got away she than sang her song and made the chefs commit suicide, themselves or by her kiss. In the end the girl and the mermaid/siren leave.