Well if you liked Kira Kira, I can recommend you Deardrops, it's from the same producer Overdrive and is also about a rock band. Though I have to say that Deardrops is not so good as Kira Kira in comparison, but still it's worth checking it. The music/songs and bgm in the game are very good!
If your going to give it a try, I would personally recommend you to only go >Riho's route
I could also recommend Hoshizora no Memoria to you. It tells romantic stories with references to astronomy. After finishing the game I had the urge to go stargazing!
And I would second Clannad, Steins;Gate &
