This is the first time I knew of this.
Yano Kenta's ex in the drama "UnO", Akane (Chisa in real life), is the vocalist of a Japanese band named "Girl Next Door". They debuted September (same month as Arashi's debut) last year under Avex Trax label.
Now, if I'm not mistaken, the whole band is in the drama right? Kenta Yano was with Girl Next Door in the beginning, well before they kicked him out. And in the drama, the band's name is "Giselle". But I'm not that sure. Coz I can't make out their faces in the drama. lol. Maybe I'll check later.
Here's the band's Official Site.