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ミリしら mirishira
Zero knowledge, not even one millimetre.
What does mirishira mean?
Short for 「1ミリも知らない」, I don't know one millimetre of it. Flat admission of total ignorance, and also a fandom pastime: watching or theorising about a work you know nothing about, on purpose.
Example
原作ミリしらのまま、みんなで見に行かない？
I know nothing about the original. Want to all go see it exactly like that?
Vibe
Who you can say this to, and how it lands.
Friends only Casual. Natural with friends, out of place at work or with strangers.
Culture note
Blunter than 初見. 初見 just means first time; ミリしら admits you could not even name a character.
The story behind mirishira
The full phrase is 一ミリも知らない, I don't know one millimetre of it. Japanese treats the millimetre as its unit for the smallest imaginable amount, so having not even that much means absolute zero. Folded into four syllables, the confession turns almost cheerful.
The game it names is older than the word. Japanese video sites in the mid 2000s ran on it: people would dub or theorise their way through works they had never seen, building whole plots from one screenshot and a hair colour. The abbreviation caught up later and slipped out of fandom chat into ordinary speech. Now ミリしら means going in blind, usually on purpose and usually with an audience.
Get mirishira in your pocket
ミリしら is one of 308 words in YABAI, a Japanese culture snack for Android. Every word comes with its meaning, an example sentence, a vibe check and a story like the one above — in 13 languages, read aloud by your device. Paid app: no ads, no sign-up, no subscription.
