What Is Jirai? Fandom Landmines, Jiei (Self-Defense) and How to Talk About What You Can't Stand

You were happily browsing fan posts when content you can’t stand suddenly showed up. Here are the meanings of jirai (landmine) and jiei (self-defense), the words people reach for in those moments, along with tips such as muting and manners for telling others what you can’t handle.

What Jirai Means

A jirai (地雷, “landmine”) is an element or expression that causes strong discomfort when you see it. The target varies enormously by person: a pairing you dislike, a particular plot turn or situation, an interpretation of a character.

It’s used as in “step on one” (accidentally see it), “jirai-mochi” (someone with clear landmines) and “minefield” (a genre with many of your landmines).

Nuances and Cautions About the Word

“Jirai” is a strong word, but within the kaiwai (fandom sphere) it’s used as a neutral declaration: “not right or wrong, just not for me.” The expression designated as a landmine isn’t bad, and the person with landmines isn’t oversensitive. When this mutual understanding breaks down, it immediately becomes a source of trouble. It is also a separate word from “jirai-kei,” the name for a style of fashion and makeup used in the wider world, so watch the context. It’s a term that developed in fan works culture, but it’s now used across oshi-katsu in general, including live-action and idol spheres.

Where the Word Comes From

It’s a metaphor that transfers the “landmine,” whose danger is hard to see until you step on it, to settings and topics you can’t stand. It spread on creative sites and social media as a warning word for self-defense, but be careful about usage that treats people themselves as dangerous objects.

Examples

• “This tag is my jirai, so I quietly muted it.”
• “I stepped on a landmine, but the person who wrote it did nothing wrong. I should have avoided it.”
• “My landmines are stated in my profile. Please check before following.”
• “Before entering a new genre, I’m the type to observe the kaiwai’s culture of content warnings first.”
• “My landmines have been increasing, so for a while I’m cutting back on searching and only following the supply.”

How It Differs From Nearby Words

Strength and how it comes across differ by word. Lining them up gives a feel for how to use each.

Even for the same “doesn’t suit me,” a jirai explains your own state and a kaishaku-chigai explains a difference in reading. Mix them and it’s hard for the other person to tell whether you’re talking about “an evaluation of the work” or “my own condition.”

Jiei (Self-Defense): The Great Principle of Fan Culture

Jiei means taking measures yourself so that things you can’t stand don’t enter your view. Specifically:

• Setting muted words and muted accounts
• Using minus-keyword searches
• Managing your timeline with locked accounts and dedicated accounts
• Reading profiles and notes before following

What matters is how this culture places responsibility. “For what you don’t want to see, it’s not ‘don’t show it’ but ‘I avoid it’”: this is the shared rule of fandom. Rather than asking creators to delete, you design your own view yourself. This principle is what makes the coexistence of diverse tastes possible.

Practical Jiei Techniques

• Register muted words including the masked-letter variants — In the kaiwai, topics circulate in search-evasion masked spellings, so muting only the official name won’t fully protect you
• Use “one cushion” (wan-kusshon) — There’s a culture of putting a warning page or image before strongly stimulating works. On the viewing side, a habit of reading the warning instead of skipping the cushion protects you
• Do research before following — Just looking at the profile, pinned post and recent posting tendencies prevents most landmine accidents
• Know that jiei has limits — However much you set up, accidents happen. If you can switch your thinking to “review the route, not blame the writer” when you step on one, you get less drained

Steps to Avoid Stepping on Someone Else’s Landmine

Behind the story of protecting yourself are ways to avoid startling others. It’s not difficult consideration, just a matter of order.

1. Read what’s written first — The notes in a profile or pinned post are signposts the person put there to reduce accidents
2. Add a word before bringing up a topic — Just checking “is it okay to talk about this work?” lets the other person keep an escape route
3. Put a cushion before strong content — Folds, warnings, masked letters. Every tool for narrowing who it reaches takes seconds to use
4. Line up tags and search-evasion — The ideal is that it reaches people looking for it and doesn’t catch people who want to avoid it
5. When it’s pointed out, fix the route — More useful than the amount of apology is a setup so it doesn’t flow the same way next time

Knowing every landmine in advance is impossible in the first place. That is why a relationship where you can change how you place things once you notice lasts longer than one where you blame each other for “not knowing.”

Manners for Telling Others Your Landmines

• Write your own landmines as a “warning note” — Writing them in your profile or pinned post is honest disclosure that prevents accidents
• Don’t tell others directly “that’s my landmine” about their work — That is not an impression but an attack
• Don’t brag about how many landmines you have — Landmines are individuality, but not a weapon.
• Don’t throw “protect yourself” at other people — Jiei is a principle you impose on yourself, not words to silence a person who stepped on one and got hurt. Even words of principle become an attack depending on how they’re used

Notes From The Oshi Lab: A System That “Reaches Only the People Who Want to See It”

The culture of “landmines and self-defense” is a textbook for content-platform design. Fandom built, on its own, the principle that “the responsibility for discomfort is solved by the receiver’s design” and ways of using the tools for it. When a company runs a community, the Lab thinks investment in systems that “reach only the people who want to see it” — search-evasion, tags, muting — should come before censorship. The conditions under which this principle works also matter: tools for avoidance (tagging, warnings, filters) must be sufficiently provided, and how to use them must be shared as a culture. Demanding only “protect yourself” without tools is pushing responsibility onto people. The responsibility to prepare zoning tools belongs to the operators of the space, and the responsibility to use them to the receiver. This division is the foundation of a community where diverse tastes coexist.

Related Terms

Pairing (coupling) / Kaishaku-chigai / Otaku account / Kaiwai