"Itsuka Kitto..." (いつかきっと…) is the debut single by Atsushi, the lead singer of the popular Japanese band Exile. It was released on September 14, 2011 as a "double A-side" along with Exile's 36th single called Rising Sun / Itsuka Kitto... (Rising Sun / いつかきっと…). The single debuted at #1 on the RIAJ's Digital Tracks Chart^[1] and #1 on the Oricon Charts with first-week physical sales of 234,846.^[2] "Itsuka Kitto" has also gained popularity as the theme song for the TV Asahi drama, “Hi wa Mata Noboru“.^[3] The song was written by Atsushi Sato, Matthew Tishler and Andrew Ang.

"Itsuka Kitto..." has since become the #14 highest-selling single in Japan for 2011, with 305,001 physical sales.^[4] It was included on the Exile/Exile Atsushi album Exile Japan/Solo released on January 1, 2012.^[5]

A remixed version was made as the theme for the Japanese release of Captain America: Civil War

"Rising Sun" is a song recorded by Japanese group EXILE. The song was the official charity anthem after the tsunami disaster. It was released in September 2011 along with Atsushi's debut single "Itsuka Kitto..." The song was written by Didrik Thott, Sebastian Thott, Johan Becker, Sharon Vaughn and EXILE ATSUSHI.