Yamagishi Kyoji, a high school student helping with his family's convenience store in Okutama, suffers a serious injury one day due to the effects of "Erosion" inside the store. After being transported to a hospital where he is healed by magic, Kyoji is drawn to jump into the "Erosion's Mouth" and discovers a labyrinth beyond it. A dungeon that suddenly appears in the modern world. And from the Erosion's Mouth, magical essence "Mana" overflows, giving birth to magic users and a new profession called "Adventurer." Materials that drop from within the dungeon are utilized in modern science, creating new industries, and the world gradually comes to understand the "Adventurer" profession.
| Word | Frequency | Difficulty |
|---|---|---|
| 改善 | 3 | 3.85 |
| 一件 | 3 | 3.59 |
| 熊 | 3 | 3.49 |
| 逃げる | 3 | 2.85 |
| 急速 | 3 | 3.88 |
| 連れ去る | 3 | 4.18 |
| この人 | 3 | 3.25 |
| 上空 | 3 | 3.31 |
| 引き続き | 3 | 4.02 |
| 発意 | 3 | 3.84 |
| どうこう | 3 | 3.96 |
| 浮力 | 3 | 4.85 |
| レーサー | 3 | 5.61 |
| 辞める | 3 | 3.79 |
| 進み | 3 | 3.58 |
| 精度 | 3 | 4.06 |
| 飛行 | 3 | 3.53 |
| 勧める | 3 | 4.06 |
| 問題点 | 3 | 4.29 |
| がてら | 3 | 4.23 |
| 多価 | 3 | 3.57 |
| すっと | 3 | 3.91 |
| じっと | 3 | 3.19 |
| 倉庫 | 3 | 3.49 |
| 独特 | 3 | 3.76 |
| いっそ | 3 | 3.65 |
| 官房長 | 3 | 6.12 |
| 焼き物 | 3 | 4.88 |
| 要は | 3 | 3.72 |
| 半ば | 3 | 3.39 |
| 死人 | 3 | 3.99 |
| 見る見る | 3 | 3.97 |
| ロシア人 | 3 | 5.49 |
| 下る | 3 | 4.06 |
| はずだ | 3 | 2.64 |
| 美味い | 3 | 3.39 |
| ワンワン | 3 | 5.01 |
| 行われる | 3 | 3.62 |
| 詳しい | 3 | 3.29 |
| 煩わしい | 3 | 4.35 |
| 人物 | 3 | 2.80 |
| 釘 | 3 | 3.92 |
| 教え込む | 3 | 5.15 |
| 目を丸くする | 3 | 4.22 |
| そよ風 | 3 | 4.65 |
| 子供達 | 3 | 3.31 |
| と思われる | 3 | 3.34 |
| 資金援助 | 3 | 5.05 |
| 耐火 | 3 | 5.09 |
| 余力 | 3 | 4.29 |
| 評判 | 3 | 3.70 |
| 公園 | 3 | 3.94 |
| 長距離 | 3 | 4.23 |
| 嫌がらせ | 3 | 3.73 |
| 安く | 3 | 3.33 |
| 幸せ | 3 | 2.99 |
| 対峙 | 3 | 3.62 |
| 必須 | 3 | 3.81 |
| 上階 | 3 | 4.70 |
| そうこう | 3 | 4.48 |
| ええと | 3 | 3.61 |
| 驚くほど | 3 | 4.05 |
| どの様 | 3 | 3.31 |
| 逸話 | 3 | 4.33 |
| 所有権 | 3 | 4.51 |
| 呪文 | 3 | 3.15 |
| 常 | 3 | 3.15 |
| 負傷者 | 3 | 4.19 |
| 専念 | 3 | 4.00 |
| 魔法使い | 3 | 3.03 |
| 待った | 3 | 3.67 |
| 計算 | 3 | 3.48 |
| 共和党 | 3 | 6.37 |
| ラテン語 | 3 | 5.53 |
| 医学生 | 3 | 5.86 |
| 当て | 3 | 3.21 |
| 商 | 3 | 3.78 |
| 纏まった | 3 | 4.11 |
| 並み | 3 | 3.87 |
| 計測 | 3 | 4.54 |
| 勢い | 3 | 2.99 |
| アクセル | 3 | 4.57 |
| えっ | 3 | 2.85 |
| 鍛える | 3 | 3.77 |
| えっと | 3 | 3.16 |
| 歩き | 3 | 3.21 |
| 倒れ | 3 | 3.21 |
| 中たる | 3 | 4.21 |
| この手 | 3 | 3.75 |
| 夕方 | 3 | 3.59 |
| 無難 | 3 | 3.98 |
| 速く | 3 | 3.79 |
| ってな | 3 | 3.50 |
| 三階 | 3 | 4.07 |
| 被害 | 3 | 3.14 |
| 奇跡 | 3 | 3.58 |
| 専門学校 | 3 | 5.27 |
| 操作 | 3 | 3.18 |
| 半年 | 3 | 3.63 |
| 平地 | 3 | 4.33 |
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