Police in Kushiro, Hokkaido, have arrested a 22-year-old man on suspicion of threatening a 13-year-old female junior high student by sending messages such as "I'm going to kill you" via a social media app on Friday.
According to police, the man and the girl were acquaintances. The incident came to light after the girl told her parents, who reported the matter to the police.
The man has admitted to the allegation but gave no motive for his actions. The case was reported by Hokkaido Broadcasting Corp.