unreasonably strict school rules
Refers to school regulations that are excessively harsh, outdated, or oppressive, often criticized in media and social discourse.
その学校のブラック校則には、髪の色や靴下の長さまで細かく決められている。
The school's unreasonably strict rules even dictate hair color and sock length in detail.
ブラック校則を見直す動きが全国で広がっている。
A movement to review unreasonably strict school rules is spreading nationwide.
Compound of ブラック (from English 'black', here meaning 'unreasonable' or 'exploitative') and 校則 (school rules). The term gained popularity in the 2010s as a social issue.