reason!!_(idolmaster)
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.