"Calling / Breathless" is the 40th single released by Japanese boyband Arashi. "Calling" was used as the theme song for the drama Last Hope starring Arashi member Masaki Aiba. "Breathless" was used as the theme song for the movie Platina Data starring Arashi member Kazunari Ninomiya.
The single was released in three editions: a regular edition and two limited editions. The regular edition includes the two A-sides, two bonus tracks, and the karaoke version of all the songs. Limited edition A includes a bonus DVD with the music video for "Calling" while limited edition B includes a bonus DVD with the music video for "Breathless". Both limited editions also include a 12-page lyrics booklet.