Can Anyone Identify This Japanese Rock Song in the Background of this Mika Nakashima Video?

Link to Mika Nakashima video here
This is a personal video of Mika Nakajima (中島 美嘉) towards the beginning of her fabulous career (2002). The song in question starts here at 5:53. I’m pretty sure the song is not hers as it’s not her style – it’s rather upbeat rock with a female lead vocalist. The video is dated Jul-2002 but who knows how old the song might be. I’d really like to get the song/CD so if anyone out there recognizes it, you’d really be helping me sleep at night. I’ve been inquiring about it on various sites on and off for over 5 years.