"Bittersweet" is the 42nd single released by Japanese boyband Arashi.

"Bittersweet" was used as the theme song for the drama Shitsuren Chocolatier starring Arashi member Jun Matsumoto.

The B-side "Road to Glory" was used as the theme song for Nippon TV's broadcast of the 2014 Winter Olympics.

[1] The single was released in two editions: a limited edition including Road to Glory and a bonus DVD with a music video for "Bittersweet", and a regular CD only edition including Road to Glory, two bonus tracks, and karaoke tracks for all the songs.

It was announced on a music talk show that Arashi member Satoshi Ohno choreographed the dance for the live performance of "Bittersweet".