Title: 迷子のエコー (Echo of a Lost Child)
Arranger: Shibayan
Lyrics: 深水チエ (Chie Fukami)
Vocals: 3L
Album: TOHO BOSSA NOVA
Circle: ShibayanRecords
Release date: May, 27th 2012 (Reitaisai 9)
Website: http://homepage3.nifty.com/shibayan/stal1201/

Original: ハルトマンの妖怪少女 ／ Hartmann’s Youkai Girl
「東方地霊殿 ～ Subterranean Animism, Koishi Komeiji’s theme」

Picture artist: kirero
http://www.pixiv.net/member_illust.php?mode=medium&illust_id=20342215

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This album is really good and I’ve listened to this song so much. Goodness. <3