Соответствующая норма
Practice Relating to Rule 100. Fair Trial Guarantees
Section G. Examination of witnesses
Japan’s Code of Criminal Procedure (1948), as amended in 2006, states:
(1) The public prosecutor and the accused or his/her counsel may attend the examination of a witness.
(3) The person prescribed in paragraph (1) of this Article may, when he/she attends the examination, examine the witness him/herself after notifying the presiding judge of his intent. 
Japan, Code of Criminal Procedure, 1948, as amended in 2006, Article 157(1) and (3).