• ひとつだけ - Koichi Tsutaya - 2009-10-21
• Happiness - Koichi Tsutaya - 2009-09-09
• MUSIC!!! - Koichi Tsutaya - 2008-08-27
• 飛行機雲 - Koichi Tsutaya - 2007-12-05
• 笑顔の残像 - KOICHI TSUTAYA - 2007-10-10
• Reason Why - Koichi Tsutaya - 2007-03-14
• WORKAHOLIC - Koichi Tsutaya - 2007-01-24
• Get the future - Koichi Tsutaya - 2006-03-01