Swear ~Night & Day~

 is a song by Roselia.

It is the title track of their 12th single, with Our Carol as the coupling track. It will be released on October 26, 2022.

It is the gift song for the event Our Everlasting Night Embracing Eternity.

It was written by Oda Asuka, and arranged and composed by Takeda Yusuke.