荒野と森と魔法の歌 (Kouya to Mori to Mahou no Uta)

Background
"Song of Wastelands, Forests, and Magic" is a song by Toraboruta-P featuring Hatsune Miku, commissioned by SEGA for the Project Diva series. Toraboruta has also created a Kagamine Rin \ Len version for the game.