Itsuka Kitto...

{{Infobox song

| name = Itsuka Kitto...

| cover = Exile Rising Sun Itsuka.jpg

| alt =

| caption = "Rising Sun" / "Itsuka Kitto..." CD Only cover artwork

| type = single

| artist = Exile Atsushi

| album = Solo

| released = September 14, 2011

| format =

| recorded =

| studio =

| venue =

| genre =

| length = 4:13

| label = Rhythm Zone

| writer = Atsushi, Matthew Tishler, Andrew Ang

| producer = Matthew Tishler

| prev_title =

| prev_year =

| next_title = Ooo Baby

| next_year = 2011

}}

{{nihongo|"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{{cite web|title=RIAJ Digital Track Chart: Chart issue September 13, 2011 |url=http://satsuki.musicdb.gr.jp/all_info/ranking_weekly/WeeklyRankingAction.do?term=2011s&weeklyCd=20110913&rankKbn=50 |work=Recording Industry Association of Japan |accessdate=16 September 2011 |url-status=dead |archiveurl=https://web.archive.org/web/20140821113843/http://satsuki.musicdb.gr.jp/all_info/ranking_weekly/WeeklyRankingAction.do?term=2011s&weeklyCd=20110913&rankKbn=50 |archivedate=21 August 2014 }} and #1 on the Oricon Charts with first-week physical sales of 234,846.{{cite web|title=Oricon reveals the monthly chart rankings for September|url=http://www.tokyohive.com/tag/rising-sunitsuka-kitto/|work=Tokyohive}} "Itsuka Kitto" has also gained popularity as the theme song for the TV Asahi drama, “Hi wa Mata Noboru“.{{cite web|title=EXILE's charity song and ATSUSHI's solo song to be released as a double A-side single!|url=http://www.tokyohive.com/2011/07/exiles-charity-song-and-atsushis-solo-song-to-be-released-as-a-double-a-side-single/|work=Tokyohive|accessdate=6 November 2011}} 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.{{cite web|title=2011 Oricon Yearly Ranking TOP 50: Singles|url=http://www.oricon.co.jp/music/special/2011/musicrank1219/index01.html|work=Oricon}} It was included on the Exile/Exile Atsushi album Exile Japan/Solo released on January 1, 2012.{{cite web|title=EXILE to release a new album on New Year's Day|url=http://www.tokyohive.com/2011/11/exile-to-release-a-new-album-on-new-years-day/|work=Tokyohive}}

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