I know this is a long shot but I figured you guys are probably the best to ask. There was a niconico dancer by the name of Kirihara Kurara, she was extremely good but she deleted both her youtube accounts and disappeared on Nico.
Only info I got is this http://dic.nicovideo.jp/a/くらら(踊り手)
Anyone following/know what she's up to nowadays? Her latest vid was from 2014.
Also does anyone have any old vids of her? Fell in love after her Iiwake Maybe cover, and this http://www.nicovideo.jp/watch/sm15499110