Yasashisa no Riyuu

 (優しさの理由) is the fourth single by ChouCho. It was released on May 2, 2012, and peaked at #28 on the Oricon single chart.

Single Information
The lead track Yasashisa no Riyuu was used as the first opening theme for the anime Hyouka.
 * Catalog Number
 * LACM-4919 (Regular Edition)
 * LACM-34919 (Limited Edition)
 * Lyrics: Kodama Saori
 * Composition: Miyazaki Makoto
 * Arrangement: Miyazaki Makoto

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 (Off Vocal)
 * 5) Komorebiiro no Kioku (Off Vocal)
 * 6) Aozora no Kodou (Off Vocal)

Limited Edition DVD

 * 1) Yasashisa no Riyuu (MUSIC CLIP)