There are at least 2 bands with the name Girl Next Door:

1) GIRL NEXT DOOR (ガール・ネクスト・ドア) is a 3-person group formed by 千紗 (CHISA, vocals), 鈴木大輔 (Daisuke Suzuki, composer and former "day after tomorrow member) and 井上裕治 (Yuji Unoue, Guitar). GIRL NEXT DOOR (also abbreviated as ガルネク (GARUNEKU) ) was created celebrating the 20th anniversary of the popular Japanese music label "avex trax" in early 2008. Even though they were formed in March, the group debuted on June holding a special live at SHIBUYA-AX.

Their debut was based a 3-monthly singles release campaign. the first one; 偶然の確率 (Guuzen no Kakuritsu), was released on September 23rd and debuted in the 3rd position of the Oricon Daily Singles Chart. Keeping its position for the rest of the week, the single debuted with around 30,000 units sold during the first week, and the last numbers reporting a total of 58,000 copies overall.

Their second single and third single were entitled "Drive away /幸福の条件" and "情熱の代償/ESCAPE" respectively. As seen, both singles were double a-sides. Both also debuted in the third position of the Oricon Weekly Singles Chart just like 偶然の確率. Their 3rd single, 情熱の代償 was selected as the theme song for the drama ギラギラ ("GIRA GIRA"). making it their first dorama tie-in.

Their self-titled debut album, GIRL NEXT DOOR was released on December 24th and sold over 110,000 copies in it's first week and sold more than 200,000 units overall.

A new single campaign was announced just about when their fourth single, Seeds of dream was about to be released. two more singles were going to be released during the year, Seeds of dream being the first of them, released on April 15th.

The second single, Infinity was selected as the theme song for the drama アタシんちの男子 ("Atashinchi no Danshi") and it's going to be released on June 10th. While the 3rd single, Be your wings will be released in August 5th and is going to be the theme song a new video game for the "Tales of..." series, to be packaged as their 1st 3 A-side single, Be your wings / FRIENDSHIP / Wait for you.

You can see their official website here.

2. Los Angeles-based Girl Next Door was an alternative/trip-hop-styled duo comprised of vocalist and guitarist Kat Green and multi-instrumentalist Billy Lincoln. Debuting in 1998 with the self-released Remembering Analogue LP, GND drew comparisons ranging from Morcheeba to Craig Armstrong. The album did well locally, and in 1999 the duo returned with the Transition EP, which featured a remix of Analogue's "Gorgeous." ~ Johnny Loftus, Rovi

They released another album Transitions in 2000. They later went on to form the project bella nova Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.