Aishiteru (Ken Hirai song)  The single was issued in both standard and limited editions. The limited edition was released in Enhanced CD format and includes live footage from Hirai's "Ken's Bar" concert in New York and the music video of "Sing Forever." The single debuted at number 10 on the Oricon Daily Singles Chart on November 9, 2010 and climbed to number 7 on November 11, 2010. It peaked at number 9 on the Oricon Weekly Singles Chart with 18,137 copies sold. The single ranked at number 24 on the Oricon Monthly Singles Chart for the month of November 2010 with 28,056 copies sold.