Sign (Mr. Children song)

Sign is the 26th single released by Japanese band Mr. Children on May 26, 2004. It served as the theme song for the popular Japanese drama Orange Days.

The song is a ballad characterized by its melodic piano intro and Sakurai Kazutoshi's emotive vocals. The lyrics explore themes of connection, support, and finding meaning in relationships. The song reflects the drama's narrative of young adults navigating love, friendship, and career aspirations.

"Sign" became one of Mr. Children's most successful singles, topping the Oricon charts and selling over a million copies. It won the 46th Japan Record Award for Song of the Year, solidifying its place as a beloved and iconic J-pop song. The single also included the B-sides "door" and "Hokorobi."