Members of Nogizaka46, Keyakizaka46, and Hiragana Keyakizaka46 have become victims of stalking.
In a statement released on their websites, the groups' management described severe violations of privacy, including chasing members in the neighborhoods they live in.
Specific members were not named as victims of stalking, though the announcement was made for all 3 sister groups, implying multiple victims across all groups.
Management is said to be stepping up its vigilance against stalking. Anyone who bothers a member of the groups will be immediately reported to the police, according to management's statement. They will also be banned from attending any group events.
In addition, fans will no longer be able to write letters or send gifts directly to the groups' members.
Stalking is a constant danger for women who become idols. There have been numerous cases of idols being stalked by fans. Some of these incidents even escalated to physical violence against the idol.
Despite being a known issue, reports of stalking are not always taken seriously by the police. Mayu Tomita reported to the police that she has been harassed by a stalker. The stalker later stabbed Tomita several times, leaving her hospitalized in critical condition.