The lawyers for a 21-year-old woman on trial for strangling an elderly woman in 2014 and attempting to kill two high school students in 2012 said she should not be found guilty because she lacks the ability "to tell right from wrong."

"I have nothing to say" to the charge of murder, the former Nagoya University student said Monday during the first session of her lay judge trial at the Nagoya District Court, during which prosecutors and her lawyers agreed on her motives but clashed over her sanity.

The woman denied she had any intent to murder the two students when she had them swallow thallium on separate occasions, saying, "I didn't think they could die."