A Black Kaisha (ブラック企業) is a company that treats employees poorly and creates a toxic work environment. Many people, including foreigners, join without knowing the reality. Knowing the warning signs can protect you.

🚩 Red Flags of a Black Company

Very long working hours with unpaid overtime

Power harassment or bullying from managers

High stress, pressure, and unrealistic deadlines

No holidays, no work–life balance

Many employees quitting quickly

Why It’s Dangerous

These companies can damage your mental health, physical health, and personal life. Some workers face burnout and depression due to extreme overwork.

How to Protect Yourself

Research company reviews before applying (e.g., Google reviews, job forums)

Ask clearly about working hours and overtime during interviews

Be careful if they avoid answering questions or pressure you to join fast

If something feels wrong, don’t stay silent — ask for help or change jobs