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 |
|---|---|---|
| 私立高校 | 1 | 6.11 |
| 後押し | 1 | 4.16 |
| 監査法人 | 1 | 7.11 |
| 食い倒れ | 1 | 5.75 |
| 手加減 | 1 | 3.71 |
| 書き割り | 1 | 6.09 |
| 2週間 | 1 | 4.56 |
| 心底 | 1 | 3.64 |
| 内部調査 | 1 | 5.67 |
| お叱り | 1 | 4.75 |
| 番 | 1 | 3.26 |
| 荒地 | 1 | 4.59 |
| 伝統 | 1 | 4.15 |
| 何人も | 1 | 3.85 |
| 山地 | 1 | 4.64 |
| 分の一 | 1 | 4.40 |
| 叱る | 1 | 3.72 |
| 昇進 | 1 | 4.32 |
| 包み | 1 | 3.81 |
| 重機 | 1 | 4.85 |
| 据える | 1 | 4.01 |
| 友人 | 1 | 3.09 |
| 甘え | 1 | 3.70 |
| 乗車定員 | 1 | 7.29 |
| 再来年 | 1 | 5.31 |
| 張り詰める | 1 | 4.21 |
| 不穏 | 1 | 3.93 |
| はたと | 1 | 4.57 |
| 定義 | 1 | 4.23 |
| 番組 | 1 | 4.40 |
| 凍土 | 1 | 5.04 |
| 持続性 | 1 | 5.70 |
| 応化 | 1 | 4.48 |
| 半 | 1 | 3.51 |
| トル | 1 | 5.99 |
| 勤続 | 1 | 5.63 |
| クる | 1 | 5.88 |
| 弾む | 1 | 4.00 |
| 使役 | 1 | 3.86 |
| ウェア | 1 | 5.28 |
| 一溜まり | 1 | 5.19 |
| 単独で | 1 | 3.96 |
| 新手 | 1 | 4.56 |
| 街区 | 1 | 4.64 |
| ドイツ語 | 1 | 4.96 |
| 席を外す | 1 | 5.11 |
| 鳴らす | 1 | 3.32 |
| 跳び | 1 | 3.81 |
| 真顔 | 1 | 4.00 |
| 雑木林 | 1 | 4.60 |
| かなー | 1 | 3.98 |
| W | 1 | 4.86 |
| 理学療法士 | 1 | 6.78 |
| 訂正 | 1 | 3.90 |
| 受信 | 1 | 4.68 |
| 物覚え | 1 | 4.94 |
| 熱弁 | 1 | 4.76 |
| 原価 | 1 | 4.95 |
| 将来的 | 1 | 4.17 |
| 路頭に迷う | 1 | 5.30 |
| 正座 | 1 | 4.08 |
| 積み込む | 1 | 4.55 |
| 折に触れて | 1 | 5.54 |
| ふくれっ面 | 1 | 5.15 |
| 面積 | 1 | 4.20 |
| 値付け | 1 | 5.48 |
| 損害 | 1 | 4.06 |
| 慣性 | 1 | 4.75 |
| リス | 1 | 3.28 |
| 難色 | 1 | 4.61 |
| 双方 | 1 | 3.76 |
| かみ砕く | 1 | 5.76 |
| 告訴 | 1 | 5.85 |
| 規格 | 1 | 4.67 |
| オークス | 1 | 5.44 |
| 野兎 | 1 | 4.11 |
| 梯 | 1 | 5.02 |
| 生まれてくる | 1 | 4.47 |
| 置き去り | 1 | 4.06 |
| 脊椎 | 1 | 5.45 |
| 噛みつく | 1 | 4.09 |
| 否でも | 1 | 4.40 |
| 耳当て | 1 | 5.77 |
| 幕開け | 1 | 5.01 |
| シェフ | 1 | 4.75 |
| トール | 1 | 3.77 |
| 境 | 1 | 4.09 |
| はしゃぐ | 1 | 3.80 |
| 右翼 | 1 | 4.32 |
| 呼び合う | 1 | 5.10 |
| 任せとけ | 1 | 4.69 |
| くくり付ける | 1 | 5.83 |
| 回り込み | 1 | 4.61 |
| 百面相 | 1 | 5.09 |
| 瞳孔反射 | 1 | 7.59 |
| 素養 | 1 | 4.43 |
| 容量 | 1 | 4.19 |
| がかる | 1 | 4.18 |
| 同意見 | 1 | 4.38 |
| 疲れた | 1 | 3.41 |
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