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 |
|---|---|---|
| 車 | 30 | 3.37 |
| 剣 | 30 | 2.24 |
| ここに | 31 | 2.60 |
| 多分 | 31 | 2.94 |
| 翌日 | 31 | 3.38 |
| でしょう | 31 | 2.49 |
| 浸食 | 31 | 4.51 |
| 可能 | 31 | 2.85 |
| 30 | 31 | 3.54 |
| 云う | 31 | 2.77 |
| によって | 31 | 2.54 |
| 燃料 | 31 | 4.07 |
| 素材 | 31 | 2.99 |
| 7 | 31 | 3.26 |
| 剔 | 31 | 2.60 |
| 買う | 31 | 2.81 |
| アンチ | 31 | 4.65 |
| 今日 | 32 | 2.61 |
| 大使 | 32 | 3.95 |
| そうです | 32 | 2.73 |
| 回復 | 32 | 2.68 |
| 元 | 32 | 2.67 |
| ゴーレム | 32 | 2.97 |
| 何とか | 32 | 2.77 |
| 呼ぶ | 32 | 2.52 |
| 多い | 32 | 2.52 |
| としても | 32 | 2.63 |
| 次 | 32 | 2.53 |
| マジック | 32 | 3.39 |
| 基本 | 32 | 3.31 |
| 姿 | 32 | 2.21 |
| フリーズ | 32 | 4.53 |
| ですが | 33 | 2.62 |
| 残り | 33 | 3.10 |
| 5 | 33 | 2.89 |
| 懸 | 33 | 2.62 |
| 英語 | 33 | 4.17 |
| 相談 | 33 | 3.14 |
| 連れて | 33 | 2.86 |
| しな | 33 | 3.10 |
| 彼方 | 33 | 2.51 |
| これで | 33 | 2.58 |
| 同じ | 33 | 2.31 |
| 技術 | 33 | 2.97 |
| バッジ | 33 | 4.79 |
| に依る | 33 | 2.76 |
| 受ける | 33 | 2.66 |
| そうした | 34 | 3.31 |
| 危険 | 34 | 2.75 |
| 殿 | 34 | 2.18 |
| 以内 | 34 | 2.31 |
| 付け | 34 | 2.69 |
| 呉れ手 | 34 | 2.75 |
| 全く | 34 | 2.49 |
| 免許 | 34 | 4.70 |
| はい | 35 | 2.31 |
| ちょっと | 35 | 2.29 |
| 習得 | 35 | 3.45 |
| 暮 | 35 | 2.46 |
| 仕様 | 35 | 2.43 |
| 一手 | 35 | 2.89 |
| 気配 | 35 | 2.79 |
| 何で | 35 | 2.52 |
| 土地 | 35 | 3.22 |
| 底荷 | 35 | 2.49 |
| 雑魚 | 35 | 3.80 |
| つつ | 35 | 2.62 |
| ならない | 36 | 2.51 |
| 警察 | 36 | 3.87 |
| 基地 | 36 | 3.79 |
| 名 | 36 | 2.55 |
| 以外 | 36 | 2.55 |
| 迷宮 | 36 | 2.71 |
| その後 | 36 | 2.80 |
| 乗る | 36 | 2.77 |
| 確認 | 36 | 2.44 |
| 学校 | 36 | 3.04 |
| 長槍 | 36 | 4.36 |
| 結構 | 36 | 2.82 |
| 銃 | 37 | 3.38 |
| 女性 | 37 | 2.55 |
| 刻 | 37 | 2.65 |
| ゴブリン | 37 | 2.93 |
| と言って | 37 | 2.71 |
| そう言う | 37 | 2.36 |
| ずい分 | 37 | 3.33 |
| 体 | 37 | 2.15 |
| テキサス | 37 | 5.67 |
| 違う | 37 | 2.29 |
| 進む | 37 | 2.84 |
| 何か | 37 | 2.12 |
| お前 | 37 | 2.16 |
| 詰まり | 38 | 2.59 |
| インゴット | 38 | 4.29 |
| 教え | 38 | 2.64 |
| そこで | 38 | 2.74 |
| にして | 38 | 2.30 |
| 口 | 38 | 2.30 |
| したい | 38 | 2.75 |
| 考え | 38 | 2.19 |
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