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...
This last song is a piano arrangement 
of my debut song as an idol.
هذه الأغنية السّابقة هي إعداد بيانو
من أغنية إطلالتي الأولى كمغنٍّ نجم
Für das letzte Stück habe ich ein Klavier-Arrangement
des Liedes geschrieben,
Mi última pieza es una versión
de mi tema de debut como idol.
La última pieza es una versión
de mi tema de debut como idol.
Le dernier morceau sera
L'ultimo brano è un arrangiamento per pianoforte
della mia canzone di debutto come idol.
A última música é um arranjo da minha
música de estreia como idol.
Последняя композиция — моя дебютная
песня в аранжировке для фортепиано.