Edogawa Teacher aka “The School Uniform Bandit”

https://www.scmp.com/news/people-culture/article/3271394/japan-teacher-uses-key-copied-five-years-ago-sneak-home-ex-pupil

These teachers, especially the homeroom ones, seem to have way too much access and involvement in students’ personal lives. Sadly there have been several other perverts besides this recent guy.