Hiyori likes to spend her times alone fly fishing. One day, a very energetic girl named Koharu tries to jump into the cold ocean in front of Hiyori and she stops her. This ends up being the beginning of their very unique relationship.
At least the ocean never changes on me.
.على الأقل المحيط لا يتغيّر علي أبداً
Wenn doch alles einfach so
konstant wäre wie das Meer …
Al menos el mar no ha cambiado.
Au moins,
la mer ne change pas, elle.
Almeno il mare non cambia mai,
 resta sempre uguale.
O mar é o único que continua o mesmo...