been trying to improve its working environment based on advice from authorities. 24-year-old matsui takahashiilled herself about a year ago. officials of the tokyo labor bureau began their probe last month. they ruled her death was due to overwork. they suspect takahashi and her colleagues were forced to underreport their working hours. they say this prevented the figures from exceeding overtime limits to which management and the labor union had agreed. labor authorities searched dentsu's offices in osaka, nagoya, and elsewhere. the investigation continues. >>> police in france may have a new lead in a case involving a missing japanese woman. they zeroed in on a message first believed to have been sent by her. they're investigating the possibility it was sent by someone else in an attempt to delay the search. 21-year-old narumi kurosaki disappeared in early december. she was last seen having dinner with another foreign student. a classmate received a text message from her phone after she failed to show up for class. it said she was going to sort out a problem with her passport at the japanese