Madoromi no Yakusoku

Madoromi no Yakusoku (まどろみの約束) is a collaboration character single by Kayano Ai and Sato Satomi. It was released on May 23, 2012, and peaked at #31 on the Oricon single chart.

Single Information
The lead track Madoromi no Yakusoku was used as the first ending theme for the anime Hyouka.
 * Catalog Number: LACM-4936
 * All Lyrics: Kodama Saori
 * Composition: Okamoto Kensuke (Track 1), Watanabe Sho (Track 2)
 * Arrangement: Okamoto Kensuke (Track 1), Sakai Yoichi (Track 2)

Tracklist

 * 1) Madoromi no Yakusoku (まどろみの約束)
 * 2) Romance wa Mada Hayai (ロマンスはまだ早い)
 * 3) Madoromi no Yakusoku (Inst.)
 * 4) Romance wa Mada Hayai (Inst.)

Featured Artists

 * Kayano Ai as Mayaka Ibara (伊原摩耶花)
 * Sato Satomi as Eru Chitanda (千反田える)