Yasashisa no Riyuu

 is the fourth single by ChouCho.

CD

 * 1) Yasashisa no Riyuu (優しさの理由)
 * 2) Komorebiiro no Kioku (木漏れ日色の記憶)
 * 3) Aozora no Kodou (青空の鼓動)
 * 4) Yasashisa no Riyuu (優しさの理由) (Off Vocal)
 * 5) Komorebiiro no Kioku (木漏れ日色の記憶) (Off Vocal)
 * 6) Aozora no Kodou (青空の鼓動) (Off Vocal)

Limited Edition DVD

 * 1) Yasashisa no Riyuu (MUSIC CLIP)