In 2005, she was in the middle of high school entrance exams as the title for her 1st single "Bokutachi no Yukue" was announced. The single was released on April 2005, and debuted at No. 1 on the Oricon charts. This was a huge success, making Hitomi the second female singer to have a debut single in the number one spot, and the third solo artist to have a debut single reach the top spot. The single ended up selling well over 100,000 copies. Hitomi soon entered Shiogama Girls High School, and started her first radio personality on Date fm (FM Sendai) called "Takahashi Hitomi: Sound D・N・A~".