Added 20 sets to [DGC] Collection

Previews & DDL:

	[DGC] 2008.09 No.621 Momoko Tani 谷桃子
	[DGC] 2008.09 No.622 Konomi Yoshikawa 吉川このみ
	[DGC] 2008.09 No.623 Mihato Ise 伊勢みはと
	[DGC] 2008.09 No.624 Kaori Ishii 石井香織
	[DGC] 2008.09 No.625 RioTina Yuzuki 柚木ティナ
	[DGC] 2008.09 No.626 RioTina Yuzuki 柚木ティナ
	[DGC] 2008.09 No.627 Megumi Kei 恵けい
	[DGC] 2008.09 No.628 Riho Hasegawa 長谷川リホ
	[DGC] 2008.09 No.629 Ran Matsunaga 松永蘭
	[DGC] 2008.09 No.630 Miho Takai 高井みほ
	[DGC] 2008.09 No.631 Nanami Kuroki 黒木ななみ
	[DGC] 2008.09 No.632 Ai Aizawa あいざわ藍
	[DGC] 2008.10 No.633 Akina Aoshima 青島あきな
	[DGC] 2008.10 No.634 Haruna Amatsubo 雨坪春菜
	[DGC] 2008.10 No.635 Iyo Hanaki 花木衣世
	[DGC] 2008.10 No.636 Chihiro Satsuki さつきちひろ
	[DGC] 2008.10 No.637 Asuka Kirara 明日花キララ
	[DGC] 2008.10 No.638 Yui Komiya 小宮ゆい
	[DGC] 2008.10 No.639 Aya Teraoka 寺岡アヤ
	[DGC] 2008.10 No.640 Saori Kigino 木々乃沙織