Under the scarlet moon, insane laughter of solitude w/lyrics (english, romaji, kanji) 

My translation.
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nicosound.anyap...
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This is a vocal arrange of Flandre Scarlet's theme song.
Song:
緋色月下、狂咲ノ絶 1st Anniversary Remix
Hiiro gekka, kyousho no zetsu
Under the scarlet moon, the insane laughter of solitude
(原曲：U.N.オーエンは彼女なのか？ (Original: U.N Owen was her?))
Vocal：nayuta (alt. name for ENS collab. 葉月なの (hatsuki nano))
Arrange：黒鳥 (Kokucho)
Lyric：いずみん/nayuta (izumin/nayuta)
(c) EastNewSound