Natsumi Tomonaga

is a Japanese modern pentathlete.

Early life Natsumi Tomonaga was born on August 22, 1991, in Sayama City, Saitama Prefecture, Japan.

She studied at Kawagoe Minami High School.

After graduating from high school in 2011, Natsumi decided to follow in her parents' footsteps, who were both police officers, and joined the Metropolitan Police Academy.

Career Natsumi practiced both swimming and athletics and was a keen athlete, but it was after her breaking the academy's female record for running 1500 meters in 4 minutes and 55 seconds, that Natsumi was scouted for Modern Pentathlon and began training professionally in 2012. A mere two years, later, Natsumi won the 54th Modern Pentathlon All Japan Championship. and second in the 2019 UIPM 2019 Asia/Oceania Championships.

In 2020, Natsumi qualified to represent Japan once again at the Tokyo Olympics 2020. The same year, on December 24, she married one of her colleagues, changing her last name from Tomonaga to Takamiya.