"Calling" / "Breathless" is the 40th single released by Japanese boy band 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.
The music for "Calling" was written by Andreas Johansson and Youwhich. The lyrics were written by s-Tnk and Eltvo. A writer from CDJournal described "Calling" as a "rocking number". The song features edgy synths that accent a heavy band sound.[4] "Breathless" was composed by Takuya Harada, Christofer Erixon, and Joakim Björnberg, with lyrics by Hydrant. CDJournal described it as a cool dance tune that also has hard elements.[4]