Added 20 sets to [DGC] Collection

Previews & DDL:

	[DGC] 2006.02 No.241 Ayaka Kida 木田彩香
	[DGC] 2006.02 No.242 Ayumi Seki せきあゆみ
	[DGC] 2006.03 No.243 Yuka Kosaka 小阪由佳
	[DGC] 2006.03 No.244 Ai Kawanaka 河中麻系
	[DGC] 2006.03 No.245 Yuna Satonaka 裡中裕奈
	[DGC] 2006.03 No.246 Kaori Takagi 高木加織
	[DGC] 2006.03 No.247 Monburan 紋舞らん
	[DGC] 2006.03 No.248 Rin Hayakawa 早川凜
	[DGC] 2006.03 No.249 Mari Hayashi 林萬理
	[DGC] 2006.03 No.250 Nanami Morishita 森下奈々美
	[DGC] 2006.03 No.251 Rin Uehara 上原りん
	[DGC] 2006.03 No.252 Yuki Miyamoto 宮本ゆき
	[DGC] 2006.03 No.253 Mizuki Horii 堀井美月
	[DGC] 2006.03 No.254 Ayano Mayama 真山あやの
	[DGC] 2006.03 No.255 Aya Hashimoto 橋本彩
	[DGC] 2006.03 No.256 Saori Murakami 村上沙織
	[DGC] 2006.04 No.257 Aki Hoshino ほしのあき
	[DGC] 2006.04 No.258 Orei Harada 原田桜玲
	[DGC] 2006.04 No.259 Reina Nakamata 中俁玲奈
	[DGC] 2006.04 No.260 Rei Noma 野間れい