Hot idol group Girl's Day will participate in Mnet Japan's viewer appreciation concert on February 4th. The annual concert is held to express Mnet's gratitude towards their viewers and this year, it features Girl's Day, Supernova, SMASH, Mugen Danshi, and actor Im Ju Hwan. "K-POP ZONE" has already featured prominent artists like 2PM and SG WannaBe in the three years it's been held, but Girl's Day will be its first ever girl group performers. The girls will perform 'Tilt My Head,' 'How Am I,' and 'Nothing Lasts Forever'. A representative of Mnet Japan revealed, "Girl's Day was chosen as the most anticipated Korean girl group for 2011 by the Japanese, which is why we invited them to perform.  We're hoping to introduce Girl's Day to Japan through Mnet Japan." Representatives of Girl's Day commented, "The girls arrived at Haneda Airport on February 3rd and were extremely touched when they saw that they were greeted by 300 Japanese fans holding placards.  Immediately upon their arrival, the girls were interviewed by Dokudane, ODINA, SIA, WPK, and other Japanese reporters, magazines, and TV programs." Meanwhile, Girl's Day is preparing for their comeback later on this March. Source + Photos: OSEN via Daum