Download MP3 【プロセカ】ECHO(full ver.)／青柳冬弥(Aoyagi Toya)×小豆沢こはね(Azusawa Kohane)｜プロセカ/Project Sekai｜Color Coded Lyrics Download MP4 【プロセカ】ECHO(full ver.)／青柳冬弥(Aoyagi Toya)×小豆沢こはね(Azusawa Kohane)｜プロセカ/Project Sekai｜Color Coded Lyrics