Security camera footage showed the suspect following the victim from a nearby railway station before the incident
Tokyo Metropolitan Government said, 'It is truly regrettable that a staff member was arrested'
Girl was unharmed in the incident, police said
Victim told police, 'I believed it because she was well dressed'
Suspect is alleged to have touched the lower body of the boy inside a hotel room in Nagasaki Prefecture in 2019
Ryusuke Saito died due to acute renal failure on January 3
Suspect told police, 'I don't know because I don't remember'
"Are you doing fine?" the suspect asked the victim after finding her drunk on a railway platform
An examination of the smartphone of the suspect by police showed the suspect sexually assaulting dozens of women
Police allege that 'the boy knew that there were many people on the streets of Umeda'