Part II
First Instance
Chapter I
Inquiry and Investigation
Article 204
(1) When a public prosecutor has arrested a suspect upon an arrest warrant or has received a suspect who was arrested upon an arrest warrant (excluding such suspect as is referred in accordance with the preceding Article), he/she shall immediately inform the suspect of the essential facts of the suspected crime and the fact that the suspect may appoint defense counsel and then, giving the suspect an opportunity for explanation ; provided, however, that when the public prosecutor has instituted prosecution during the time limitation, he/she shall not be required to request detention.
Rights during investigation - informed of belief that crime has been committed
Rights during investigation - legal assistance
Rights during trial - unsworn oral or written statement in defence
EDIT.