Inoue Yosui (57) did a special live Christmas concert in Tokyo at the Ebisu Garden hall on the 23rd of December. About 800 people were in attendance.

Hikki made a special appearance at this concert. Hikki and Yosui are known to be good friends.
Hikki was introduced as a surprise, midconcert as she got up from her seat, and she did a duet with Yousui, singing "Automatic" and "Kohri no sekai".

http://www.sanspo.com/geino/top/gt200512/gt2005122403.html
http://headlines.yahoo.co.jp/hl?a=20051224-00000018-dal-ent
http://www.sponichi.co.jp/entertainment/news/2005/12/24/01.html
http://www.yomiuri.co.jp/hochi/geinou/dec/o20051223_30.htm
http://www.nikkansports.com/ns/entertainment/p-et-tp0-051224-0008.html