Suspect allegedly slashed the throat of the victim on July 23
TokyoReporter
Suspect said, 'I had the air conditioning on'
Suspect told police that he regularly did what is known as nampa --- meaning to pick up girls
Girl suffered unspecified injuries that will require one week to heal, police said
Suspect allegedly stole 21 pairs of the victim's underwear
Prior to the incident, the girl exited a shopping mall by bicycle
Over a 30-minute period, the woman attempted to fend off the suspect and screamed for help
Victim had vomited blood, police said
Suspect said of one victim, 'She signed a pledge to be a sex slave'
As of Monday, police had not found the murder weapon