kattun - This group is j-pop group, a group which is popular in Japan I should say. They have 6 members and kattun stands for each members first surname. K-kamenashi who is the first lead vocal A-akanishi second lead vocal T-tatsuya T-tanaka U-ueda and lastly N-nakamaru. They are members of Johnny's Entertainment. They have two music videos which I should say they are really great. Checkin' out guys on youtube entitled real face and signal.