Frantic rescue efforts by creditors of the failing Daiei group, Japan's second-largest retailing chain, were a sharp reminder of bad-debt problems facing the banks. Investors swiftly cashed in on recent gains generated by indications that the government was ready to step in to help banks. The big two, Mizuho, and Sumitomo Mitsui, fell by more than 2% as the market awaited hard news of any rescue.