Nagasawa was chosen to star in a movie called Gunjo, based on a novel by Ayako Miyagi and directed by Yosuke Nakagawa. It is the second Japanese movie produced by 20th Century Fox. Filming finished on August 5, 2008 and includes her first actual love scene. It was to be released in spring 2009, although Fox aimed to have it premier at the Berlin International Film Festival in February.[dated info]
She and Odagiri Joe starred in the TBS drama, Boku no Imoto. They played siblings.
On October 20, 2009, Nagasawa starred in a movie titled Magare! Spoon. It premiered at the Tokyo International Film Festival. In the film, she plays a clumsy assistant director of a TV show about the paranormal, unaware that the cafe she is stranded at on Christmas Eve is the location for an annual gathering of men with psychic powers.
To celebrate its 50th anniversary in 2010, Fuji TV announced a major television drama special: Wagaya no Rekishi. The story takes place between 1945 and 1964, chronicling the lives of the seven members of the fictional Yame family. Nagasawa is among the cast members. The drama will air on three consecutive nights during spring 2010.
2007: Japan Dental Association: Best Smile of the Year
2008: Video Research Ltd. TV commercial data for 2007 revealed that for the Kanzai region of Japan, Masami overtook Yukie Nakama to be "CM Queen" by just a couple hours. In Nagoya, Masami took the 2nd place.