Umineko Motion Graphic vol. 1 - 幻耀の蝶 (The Glimmering Butterflies) by Project 205. This is one of the tracks in なかない君と嘆きの幻想.
Translations provided by Atashi (atashi.wordpress.com).
Track no.: 1
Only the lyrics are subbed in this video because I couldn't find translations for the words that appear in the video =/
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The Umineko Motion Graphics (sometimes shortened to just UMG) are very popular fanworks created...