unreasonably strict school rules
Refers to school regulations that are excessively harsh, outdated, or oppressive, often criticized in media and social discourse.
The school's unreasonably strict rules even dictate hair color and sock length in detail.
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.