Coline Aguirre first began to imagine her future during a high school exchange program in Japan a decade ago.Aguirre, who was born in Paris but moved around a lot as a child, spent a year studying in Kanagawa, a prefecture about 40 miles outside Tokyo.During a visit to her host family’s grandparents in the countryside, she discovered that they lived in a traditional Japanese house built in the ’70s, with elegant wooden beams and beautiful…