Born into a family of musicians, Procella member Rui Minazuki and his older brother Rei were taught piano beginning at a young age.
Rui was quickly praised as a prodigy, but Rei was devastated by his brother's talent and abandoned the path of music.
Because of that, the two were alienated from one another for a long time, but currently the bad blood between them has been resolved, and they're back to getting along as brothers.

One day, Rui is asked to perform a piano recital as part of promoting the Full Moon Festival.
Together the members of Procella brainstorm ideas for the recital, and they go to visit Kai on the job in order to get his opinion as well.
By coincidence, this outing takes them to the university hospital where Rei works...
It's the sound that taught me 
how wonderful the piano can be.
هذا هو الصّوت الذي علّمني مدى روعة البيانو
der besondere Klang, der mir
die Herrlichkeit des Klavierspiels …
Es el sonido que me mostró
cuán maravilloso podía ser el piano.
Es el sonido que me demostró
lo maravilloso que podía ser el piano.
C’est cette mélodie familière,
qui résonne en moi
È quel suono che mi ha insegnato
quanto può essere meraviglioso il pianoforte.
É o som que me ensinou
como o piano pode ser maravilhoso.
Благодаря ему я понял, как изумительно
может звучать фортепиано.