Nagasawa Masami was born on born June 3, 1987 in Iwata, Shizuoka.
She is a Japanese actress that works for Toho Entertainment.
Nagasawa is the daughter of Kazuaki Nagasawa, the former manager of the J. League (Japanese professional association football league) team Júbilo Iwata.
She graduated from Horikoshi High School, the same high school attended by other Japanese stars Ayumi Hamasaki, Ayase Haruka, Aya Ueto, Jun Matsumoto, Tomohisa Yamashita and Tanaka Koki.
In 2005, 2006 and 2007 she was the cover girl for Toho Calendar.
In March 2006, Nagasawa was voted the Most Popular Actress in Oricon Style.
She has appeared in eighteen movies, including two Godzilla movies, Godzilla: Tokyo SOS (2003) and Godzilla: Final Wars (2004).
Nagasawa has worked on twenty three TV dramas, the first one being Pure Soul in 2001.
Her latest movie is Magare! Spoon, is currently under production.