"Monster parents" refers to parents who make selfish and unreasonable demands on schools and other institutions. They are called "monpe" for short. (From W●kipedia "Monster Parents"). My wife, who is a teacher at an elementary school in the city, recently received a scolding phone call from a parent of one of her classmates, and decided to make a home visit... Apparently, the meeting was with a "monpe," who has been much talked about recently, and the school was considerate enough to install a small camera to record the visit...