The stage name "Fujii" was chosen for her resemblance to singer Lena Fujii. Before entering the entertainment industry, in 2008, she started a blog, "Shelly"s Beloved" (いとしのシェリー). AV debut - KMP
In the same year, 2008, it was announced she was entering the AV industry with the KMP company on their Million label as its new contract girl after the retirement of Rika Asao (浅尾リカ).
Her debut movie was Shelly Fujii graces (美神 藤井シェリー), released by KMP in November 2008.
In September 2009, it was announced that she had been chosen to play the android Yuria Type 100 in the V-Cinema Yuria 100%, a live-action adaptation of the popular manga series Yuria 100 Shiki. The video was released in Japan in November 2009.
Fujii is the third actress, following Yu Ayanami (綾波優) and Rika Asao, to work exclusively with KMP for a full year without interruption. To celebrate this, in October 2009, KMP chose her profile page as the opening page for its Japan-United States official website.
Also in 2010, she played a role in the "Poltergeist" section of the V-Cinema erotic horror movie Ero Kowai Kaidan (エロ怖い怪談), which was directed by Naoyuki Tomomatsu.
Later in 2010, KMP released her first 3D adult video, Beautiful 3D - Squirting Ejection!. Fujii was one of eight AV actresses interviewed by Yukihiro Kuroba (黒羽幸宏) for the May 2011 book Naked Heart (裸心, Hadaka Shin) (), published by Shueisha, which explored the reasons why they chose to enter the adult video industry. Also in May 2011, Fujii starred in the video Cosmos Plan 30-Year Anniversary Commemoration - An Infirmary Foreign Adults, which celebrated the 30th anniversary of the AV company Cosmos Plan which was closely affiliated with KMP. As part of the celebration of her three-year anniversary with KMP, Fujii performed in a four-hour video with 4 sections directed by 4 well known AV directors: Hideto Aki, K*West, Takuan & Company Matsuo.