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, he/she shall immediately release the suspect when he/she believes that it is not necessary to detain the suspect, or shall request a judge to detain the suspect within 48 hours of the suspect being placed under physical restraint when he/she believes that it is necessary to detain the suspect ; provided, however, that when the public prosecutor has instituted prosecution during the time limitation, he/she shall not be required to request detention.
EDIT.