Romeo is a song in the Kokuhaku Jikkou Iinkai series, and eventually the first song in its Idol series sub-branch. Unlike the PVs that came before it, this one serves as the music video to an in-universe established song interspersed with scenes of other characters at the point in time the music video debuted. It also introduces Yuujirou and Aizou, the duo that forms LIP×LIP, properly to the audience both as characters and as an out-of-universe unit.
The subject of the song itself concerns two Princes of a West and an East kingdom, in-universe played by Yuujirou and Aizou, who seek to woo the same princess (played by Narumi Sena) and have her choose between the two of them. This particular release is the shorter N.Edit of the song, with the full version later released on the fourth HoneyWorks album Nandodatte, Suki. ~Kokuhaku Jikkou Iinkai~ and the LIP×LIP album Docchi no kiss ka, Erabe yo. with their seiyuu. Another remix of the song exists on the LIPxLIP single Nonfantasy/Hitsuyo Fukaketsu.
The song has been covered by the band Hello, Happy World! in the game BanG Dream! Girls Band Party.