Also known as: reason!!
The opening theme to the anime adaptation of THE IDOLM@STER: SideM. Sung by the focus groups of the anime, Dramatic Stars (Idolmaster), Jupiter, Beit (Idolmaster), S.E.M (Idolmaster), High X Joker (Idolmaster), and W.
The outfit worn during the sequence is an Idol costume; a red & Jacket with Epaulettes and folded Short Sleeves, a blue Vest with a Black Necktie underneath, and Black Pants.