笑顔の君は太陽さ / 君の代わりは居やしない / What is LOVE? by モーニング娘。

Egao no Kimi wa Taiyou sa / Kimi no Kawari wa Iyashinai / What is LOVE? (Japanese 『笑顔の君は太陽さ／君の代わりは居やしない／What is LOVE?』) is Morning Musume's 55th single, and the first to be released under the name of Morning Musume '14. It was released on January 29, 2014 in 6 editions: 2 regular and 4 limited editions. "Kimi no Kawari wa Iyashinai" will be the official cheer song for the 2014 Winter Olympics Japanese Team, while "What is LOVE?" was the ending theme for the NHK World show J-Melo from October through December 2013.The music video for "Egao no Kimi wa Taiyou sa" was released on 25 December 2013 on Mezamashi TV at 6am (JST). The Music Video for "What is Love?" was released on 2 January 2014 The single debuted at number one on the Weekly Oricon Singles Chart.