, we now have to carefully narrow them down to 10, and the points of argument from 20 to five," said Kunihiko Sakai, a prosecutor with the Supreme Public Prosecutors Office, which is overseeing the changes.

"For more than 50 years, we took it for granted that the judges will read everything we submit, so it's in our DNA that the more information, the better. But now, we have to make an effort regarding how to present the facts to lay judges using less evidence. So it's really about changing our mind-sets," Sakai said.

Prosecutors are attending workshops on the reforms to help put the new procedures into practice and to make them work better in the courtroom, he added.

Meanwhile, defense lawyers who previously had limited access to the evidence prosecutors planned to present in court, are also welcoming the changes.