The meaning of the song is about wanting romance in an unromantic world - they are desperate to be with this person - they want to be needed as much as the person needs a coffee machine or a car. I want to be yours is the driving message, and it is accompanied with desperate attempts to be anything for that person and the lyrics are Inspired by a Poem produced by John Cooper Clark.
I wanna be your knight is the third ending theme of the Nijiiro Days anime, used for episodes 9-12. It is Tomoya Matsunaga's character song and is performed by Mattsun's voice actor, Takuya Eguchi. The album is bundled with the second ending theme. 781b155fdc