Zheng Yongshan (鄭 永善, born 1972), who also goes by the name of Mie Taniguchi (谷口 充恵), is a mainland Chinese immigrant in Japan who was convicted of killing two children and sentenced to life imprisonment.

She stabbed the two classmates in the stomach and back with a 20-centimeter, thin, fish-cutting blade.

Zheng then dumped the bodies in Nagahama, Shiga Prefecture, a small town 300 km (190 mi) southwest of Tokyo.

[2] After dumping the bodies, Zheng parked the car 56 km (35 mi) away from the crime scene; she still had the knife used in the killings in her possession.

[3] Prosecutors demanded death, but Zheng was sentenced to life imprisonment without parole after she was diagnosed with schizophrenia.