The first time I came across Kimi ga Iru Kara on YouTube, I didn’t notice anything special about the song. But upon repeated listenings, I realized that this song is full of unique modulations that one does not typically find in Japanese pop songs. The driving force behind this piece is the key change between the tonic and the flattened fifth (B major and F major and all their related keys). Who would have thought to implement that into a pop song? That is simply genius, Hamauzu-san.
Some challenges in arranging this piece was getting the page turns to be as unobtrusive as possible, while minimizing the number of pages. Also there is a part in the first introduction where I use a triplet. This is to accommodate for the rolled chord that comes right after. There are also some subtle rhythmic differences between my arrangements and the original for the sake of pianistic writing and ease of playing.