Hikaru has started to make new Japanese music again, but continued on making all the music herself. Usually, a singer/songwriter will only write the music and the lyrics, but Hikaru decided she wanted to arrange her songs all by herself as well. She released her new album, "Ultra Blue", in mid-2006. Soon after, she went on a tour all across Japan. This is the second time she has ever done this (despite her singing for eight years).