Karei naru Ichizoku
From DramaWiki
Theme Song
In the credit of Karei-naru Ichizoku, it show that the ﾒｲﾝﾃｰﾏ (Main Theme) is the orchestral music that perform by ﾌｨﾙﾊｰﾓﾆｰｱ交響楽団 and conduct by Hattori Takayuki. I think the theme song should be this music piece.