"Itsuka Kitto..." (いつかきっと…) is the debut single by Atsushi, the lead singer of the popular Japanese band Exile.

[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.

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.