Artist: Nakanomori BAND (click to vist official website)
Song: "Oh My Darlin" from the album OH MY DARLIN' - Girls having Fun
(click pic to purchase album)
Oh My Darlin'- video DL
a little about the band:
"..currently four member Girl Rock band who began in early 2005 under record company Teichiku Entertainment. The band's leading vocalist/guitarist Ayako was the runner up for the Starlight auditions in 2000 out of 1,000 entrants. The winner of this competition was the vocalist for the popular band w-inds, Keita Tachibana..."
and here's a screencap from the video of my future wife and lead singer of Nakanomori Band