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地雷 jirai
A landmine. Hard no.
What does jirai mean?
The topic, trope or type of person that sets you off instantly. Friends quietly memorize each other's minefields.
Example
その話題、私の地雷なんだ。
That topic is a landmine for me.
Vibe
Who you can say this to, and how it lands.
Be careful This one carries weight. Read the meaning and the story before you say it to anyone.
Aimed at another person, this is an insult.
The story behind jirai
Calling something a landmine is unusually blunt for Japanese, and that is why it works. A landmine is invisible, harmless until touched, and the damage is entirely disproportionate to the size of the step. Everyone has a few, and part of any friendship is learning the map.
The word covers ground from the mild to the serious: a plot device you cannot stand, a topic that ruins the mood, a type of person you should have avoided. Around 2020 it also gave its name to a fashion style built on frilly darkness and unstable romance, which took the metaphor, embraced the insult and wore it deliberately.