L.M.B.G (Little Marching Band Girls) is an 18 person idol unit in Idolmaster Cinderella Girls featuring many of the youngest and smallest girls of the cast. Originally only 15 members, the group gained three more in the spin-off game Starlight Stage with the debut of their song Hi-Fi☆Days on March 31st, 2016, due to most of the members being unvoiced.
On June 19th, 2017, the Starlight Stage unit was featured for a second time, in the debut event for the mobile game version of the song Yes! Party Time!!, from the PlayStation VR spin-off game Idolmaster Cinderella Girls Viewing Revolution.