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.
Fish are like humans
and go through rigor mortis.
.الأسماك كالبشر تمرّ بمرحلة تخشّب
Fische haben ebenfalls eine Leichenstarre,
so wie wir Menschen.
A los peces les da rigor mortis
igual que a la gente.
La rigidité cadavérique,
comme chez les humains.
Anche i pesci, come le persone, 
si irrigidiscono dopo la morte.
Os peixes passam pelo enrijecimento
pós-morte, assim como os humanos.