The baronial manors, rolling lawns and private clubs in the fictional suburban backdrop of the new Apple TV+ series “Your Friends & Neighbors” bear little resemblance to the buzzing sidewalks, neon lights and hidden warrens of Tokyo. But for the actress Olivia Munn, who plays an outsider turned socialite on the show, her childhood years in the city helped inform the role.

At age 8, Ms. Munn, now 44, moved from Oklahoma City, where she was born, to Yokota Air Base in Tokyo, along with her mom, then stepdad (an Air Force major) and four siblings. Suddenly, she was the odd kid out, “thrust into new worlds” where she became determined to find her place, she said in a recent video interview. “I really got good at observing people.”

Over the better part of a decade, she explored the now Instagram-famous alleys of Omoide Yokocho, where packed, tiny restaurants served “the most amazing yakisoba”; teeming Harajuku, where “everyone dressed up like anime” on Sundays; the warren of games and gadgetry in the Akihabara electronics district, where she and her brother combed through the bins for Casio watches; and Mount Fuji, about 60 miles away but visible from the city’s high-rises, where she and her family twice hiked to the summit and were rewarded with steaming ramen and stunning views.

Ms. Munn moved back to the United States at 16 and attended the University of Oklahoma before going on to a career that has included the HBO series “The Newsroom” and the superhero blockbuster “X-Men: Apocalypse.” Though she minored in Japanese, her language skills have slipped a bit, she said, but “it all comes back to me” with a little practice when she makes one of her regular trips back to Tokyo.