異世界

• 読み: いせかい
• ローマ字: isekai
• 漢字の分解: 異 (different/strange) + 世 (world/generation) + 界 (boundary/realm) → a different world
• 発音: /i.se.ka.i/

意味

Another world — a fantasy genre where characters are transported to or reborn in a different world, hugely popular in anime, manga, and light novels.

異世界 literally means 'different world' and has become synonymous with one of the most dominant genres in modern Japanese fiction. Typically, a protagonist from modern Japan dies or is summoned to a fantasy world where they possess unique abilities. The genre has become so prolific that it is frequently both celebrated and satirized. In casual conversation, 異世界 can also describe any surreal or otherworldly experience.

例文

1. 最近の異世界アニメ多すぎて追いきれない。
2. 異世界転生したらチート能力もらえるっていう設定もう飽きた。
3. この景色すごすぎて異世界にいるみたい。

使い方ガイド

場面: anime discussion, manga, light novels, social media

トーン: descriptive, enthusiastic or sarcastic

正しい言い方

• 異世界ものでおすすめある？ (Got any isekai recommendations?)
• このカフェ異世界感あるね (This cafe has an otherworldly vibe)

避ける言い方

• 異世界に詳しくない人に専門用語を並べない (Don't rattle off genre jargon to people unfamiliar with isekai)

よくある間違い

• Thinking 異世界 always involves reincarnation — some stories involve summoning or portals instead
• Pronouncing it as 'ai-se-kai' instead of 'i-se-kai'

起源と歴史

The kanji compound 異世界 (different world) has existed in Japanese for centuries, but its modern usage as a genre label exploded in the 2010s through web novel platforms like Shousetsuka ni Narou. The genre's roots trace to older works like Escaflowne and Inuyasha.

文化的背景

時代: 2010s web novel boom, now mainstream

世代: All ages (especially Gen Z and Millennials)

社会的背景: Otaku culture, now mainstream entertainment

地域メモ: Used across Japan and internationally. One of the most recognized Japanese genre terms worldwide.