This wasn't a hit or an official single from Misia, but it's just one of my favourite songs by her. "Sunny Day" came from her 3rd album "Marvelous" which came out in April 2001 and hit No. 1 before becoming the 8th-ranked album of the year. The album also has one of her bona fide hits, "Everything", a Xmas and karaoke favourite.
But "Sunny Day", true to its title, is just a happy-go-lucky strutworthy outing for the Nagasaki native. The concert version is great but I love the album version for the backing chorus behind her. It was written by Chihiro Close（黒須チヒロ） and composed by Nobuyuki Shimizu（清水信之）.