In 2002, while still a student, Ozawa appeared in a short (30 second) Japanese TV commercial for DARS Chocolate with the two members of the Japanese pop group KinKi Kids. The commercial has her sharing chocolate with one singer while secretly holding hands with the other.
Ozawa first became familiar with AVs (adult videos) by watching sex tapes that belonged to a friend's brother.Unlike most AV actresses, Ozawa was not scouted. Instead, she was introduced to the AV industry through a friend appearing in AVs.Interested in the industry, Ozawa researched companies until she found B-open, a modeling agency she liked. She applied to the company and was accepted.She began by modeling as Miyabi for the pornographic site Shirouto-Teien.com in June 2005, which resulted in several sets of photographs and even a short hardcore gonzo video released in CD-R and DVD-R formats.
She was then signed by S1 No. 1 Style, an AV studio that produces light hardcore pornography, premiering as Maria Ozawa on October 7, 2005 with the video New Face – Number One Style directed by Hideto Aki.Ozawa remembers that she was so nervous during the filming of her first AV that she could not look the male actor in the face.At S1, Ozawa subsequently appeared in one original video per month until February 2007. She was involved in several S1 compilation videos including the company’s entry in the 2006 AV Open, a competition between Japanese porn studios for the best selling video. The S1 video Hyper – Barely There Mosaic , featuring Maria Ozawa along with other AV idols Sora Aoi, Yua Aida, Yuma Asami, and Honoka (plus a short preview for Rin Aoki), won first place.
Besides adult videos, she has appeared in V-Cinema films, a photobook and several glamour ("gravure") videos. In 2007, she played the character Anitaon the popular Japanese TV drama Tokumei Kakarichō Tadano Hitoshi on TV Asahi. In addition, Ozawa was on a 2007 episode of the Japanese variety show Megami no hatena ("The Goddess of What Is That") on Nihon TV as part of a series with AV actresses telling why they went into AV work.She has also appeared on Japanese MTV with the hip hop artist SEAMO, who is also a fan,and in the 2007 music video Summer Time in the D.S.C. with the Yokohama hip hop group DS455.
Ozawa could be seen in 2007 performing twice at the Shinjuku striptease bar "Shinjuku New Art". She took dance lessons to prepare but was still very nervous. She danced in a variety of outfits including appearing as a belly-dancer, a geisha and a cowgirl. Three videos were released of her performance and a behind-the-scenes interview.
She followed up on her Shinjuku experience by starring in a cabaret show in Macao. The show, called "Tokyo Nights", ran at the Rockza night club in the Grand Lisboa Hotel from August 16 to September 6, 2008 and featured Ozawa and several other Japanese performers. The shows received mixed reviews. Promotional materials show her with a (temporary) tattoo.
In 2008, Ozawa acted in her first mainstream movie, Invitation Only, billed as "Taiwan's First-Ever Slasher Horror".The film is produced by Three Dots Entertainment in Taipei, Taiwan and co-stars Julianne Chu. Ozawa plays a supermodel and has dialog in English and Japanese. Her professionalism impressed her co-workers and her role was expanded to include further scenes. The film was released in Taiwan in August 2008.Ozawa, who is very popular in Taiwan, also did a photoshoot for the Taiwan version of FHM magazine in May 2009.
According to a September 2009 news report, production house Maxima Pictures is "pulling the necessary strings" to have Ozawa appear in an Indonesian comedy film titled Menculik Miyabi ("Kidnapping Miyabi"), which will be released in Indonesia at the end of 2009.Although advertisements in the Indonesian language calling Ozawa's Muslim fans to piety and featuring Ozawa in jilbāb (Indonesian hijab) were issued on occasions of Ramadan and Eid ul-Fitr, the Indonesian Ulema Council condemned the efforts for the film.
Her hobbies include cooking and watching AVs on her flatscreen television set. She also enjoys playing video games, and owns a pink Nintendo DS Lite, and a pink PlayStation 2 console. Ozawa has been fairly open about her private life granting several interviews and keeping a very detailed text and picture blog of her life and activities dating back to October 2005.
During a 2007 interview, Ozawa reported that her interest in the AV industry remains high, and her video cabinet contains nothing but AVs. She makes a good living from the industry, living in a mansion (a high-class apartment) with a US$1,682-per-month rent, and earning a minimum of $8,000 per month.However, while she says that she would quit the industry only if she is forced to do something else, she would try to prevent a friend from beginning work in the AV industry.Ozawa's family and friends are against her chosen profession in spite of her apparent pride in her work. When she brought several of her videos home to show her parents, they refused to watch them and told her to get out.