OSAKA — Atsuko Sato runs a private detective agency to help clients look for their first love.

The agency, appropriately named First Love, searches for people her clients fell in love with for the first time in their lives and spent time with but have not heard from again since parting ways.

"Of course, it's OK if the person was not their first love. We can find 95 percent of the people in their memories," Sato, 56, said, speaking at her office in Chuo Ward, Osaka, where stacks of phone directories are kept in order.