初音ミクの優しい眠り (Hatsune Miku no Yasashii Nemuri)

Background
"The Gentle Sleep of Hatsune Miku" is an original song by Miru featuring CUL, galaco, GUMI, IA, Lily, MAYU, Mew, SF-A2 miki, VY1, Tone Rion, Hatsune Miku, Megurine Luka, Kaai Yuki, Nekomura Iroha, Yuzuki Yukari, Aoki Lapis, Kagamine Rin and Kagamine Len.