A 47-year-old woman, Hatsue Hirano, was arrested for the fourth time on fraud charges.
The suspect allegedly deceived a 30-year-old man in Yamagata City out of 20,000 yen.
The perpetrator used a recurring ruse involving urgent travel needs for herself and her child.
Authorities are investigating a series of similar deceptive financial crimes across Yamagata and Tendo cities.