In early 2007, Ozawa, along with Rin Suzuka, Reina Matsushima and Rin Aoki, left S1 with its emphasis on glamour to a new start-up company, DAS, which featured graphic scenes of creampie and simulated rape. The S1 video Hyper – Barely There Mosaic (ハイパーギリギリモザイク), featuring Ozawa along with other AV idols Sora Aoi, Yua Aida, Yuma Asami, and Honoka (plus a short preview for Rin Aoki), won first place. She was involved in several S1 compilation videos including the company's entry in the 2006 AV Open, a competition between Japanese AV studios for the best selling video. At S1, Ozawa subsequently appeared in one original video per month until February 2007. Ozawa remembers that she was so nervous during the filming of her first AV that she could not look at her co-star in the face. On October 7, 2005, she premiered as Maria Ozawa with the video New Face – Number One Style (新人xギリモザナンバーワンスタイル), directed by Hideto Aki.

1 Style, an AV studio that produces hardcore pornography. She began by modeling in June 2005 under the name Miyabi for the pornographic site, which resulted in several sets of photographs and a short hardcore gonzo which was video released in CD-R and DVD-R formats. She was introduced to the industry by a friend who appeared in AVs. Unlike most AV actresses, Ozawa was not scouted.

Ozawa discovered adult videos (AV) by watching sex tapes she borrowed from a friend's brother. Ozawa is featured sharing chocolate with one of the two singers while secretly holding hands with the other. In 2002, when she was 16, Ozawa debuted in a 30-second Japanese TV commercial for DARS Chocolate alongside the Japanese pop duo KinKi Kids. She has revealed that she became sexually active at the age of 13. Ozawa played ice hockey daily and often sang karaoke after classes. Ozawa graduated from the Christian Academy in Japan and has asserted that she has a higher ability to read and write English than Japanese. Her mother is Japanese and her father is French Canadian.

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