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原作勢 gensaku zei
Team read-it-first.
What does gensaku zei mean?
Fans who came from the manga or novel and now watch the adaptation with one eyebrow permanently raised. Usually said with affection, occasionally with a sigh.
Example
原作勢だから、アニメの改変がどうしても気になる。
I read the original, so the anime's changes really bother me.
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.
The story behind gensaku zei
The suffix 勢 means a force, a faction, and Japanese fandom uses it to sort everyone by how they arrived: アニメ勢 who came through the adaptation, 初見勢 seeing it for the first time, 復帰勢 returning after years away, 無課金勢 who refuse to spend money. 原作勢 are the ones who read it first.
Being 原作勢 is a permanent condition. You watch an adaptation with a second copy running in your head, noticing the cut scene, the compressed arc, the line that landed differently. The faction also carries an obligation: not spoiling the アニメ勢, who are experiencing this week what you experienced years ago. Most 原作勢 grumble affectionately and buy the disc anyway.