Symphonic Rain (Shinfonikku Rein) is a visual novel developed by Kogado Studio. I have played several visual novels in the past, but this one is different, reason being the music games / rhythm games in it.
I wasn’t a fan of music games, but I have to admit that I enjoy playing the rhythm games of Symphonic Rain. 
The songs are also beautiful that they keep playing inside my head.
You play as Chris Vertin, a fortell (fictional keyboard-type music instrument) player studying in Piova Music Institute, in a city where rain never stops falling. Each route is basically all about you finding a vocalist to pair with for your graduation recital, while having a long-distance relationship with Arietta, the girlfriend of Chris.
Following are links to guides / walkthrough to the game Symphonic Rain:
