Mother Ninja is a collaboration group featuring rappers motsu (m.o.v.e) and Geeny (Mitsuhiro Hidaka of AAA), as well as singer Aboo (Akico of Amasia Landscape). They released their debut mini-album Spontaneous in August of 2007. The album features ten tracks, including Talkin' bout Good Days which is the ending song for the racing-themed anime Wangan Midnight.
More on Mother Ninja (Off site)
m.o.v.e Official Site (Japanese or English)Amasia Landscape Official Site
Wangan Midnight Ending @ Youtube
Review of Spontaneous @ J!-ENT