pia has posted a collaborative photoshoot with the vocalists of Grieva (グリーヴァ) and ΛrlequiΩ (アルルカン). The original article is here, but I've posted the full-res pictures below:
1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15 - 16 - 17