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 |
|---|---|---|
| 大急ぎ | 1 | 4.45 |
| 衆人環視 | 1 | 4.96 |
| 受付 | 1 | 3.53 |
| とろける | 1 | 4.51 |
| 太郎 | 1 | 3.79 |
| 昇格 | 1 | 3.97 |
| 砲撃 | 1 | 3.88 |
| 工学部 | 1 | 5.94 |
| 泥臭い | 1 | 4.93 |
| 防弾チョッキ | 1 | 5.59 |
| 水を向ける | 1 | 5.26 |
| アドバイザー | 1 | 5.13 |
| 付きまとう | 1 | 4.40 |
| もう一方 | 1 | 4.35 |
| ちらつく | 1 | 4.51 |
| 豪勢 | 1 | 4.42 |
| 出で立ち | 1 | 4.45 |
| 掻き | 1 | 3.88 |
| お馴染み | 1 | 4.43 |
| 買い食い | 1 | 4.72 |
| 三年 | 1 | 3.75 |
| 呼びつける | 1 | 4.39 |
| 1000円 | 1 | 5.54 |
| 釣られる | 1 | 4.51 |
| 割かし | 1 | 5.21 |
| 天気 | 1 | 4.09 |
| ネス | 1 | 4.67 |
| 粘着性 | 1 | 5.26 |
| 今更ながら | 1 | 4.17 |
| 入れ違い | 1 | 4.78 |
| ずらっと | 1 | 5.11 |
| MBA | 1 | 6.55 |
| 明かす | 1 | 3.95 |
| お手上げ | 1 | 4.54 |
| 耐え抜く | 1 | 4.94 |
| 先制攻撃 | 1 | 4.51 |
| 窃盗団 | 1 | 5.39 |
| 這々の体 | 1 | 5.74 |
| 遠足 | 1 | 4.63 |
| 加賀 | 1 | 3.82 |
| 溢れ | 1 | 3.33 |
| ペンション | 1 | 5.89 |
| 10日 | 1 | 4.28 |
| 反芻 | 1 | 4.32 |
| 警察官 | 1 | 4.60 |
| 第三セクター | 1 | 6.75 |
| 後付け | 1 | 4.94 |
| どうしたもんか | 1 | 4.68 |
| 伊蘭 | 1 | 4.40 |
| 新興 | 1 | 4.65 |
| X | 1 | 4.16 |
| タンク | 1 | 4.22 |
| 隣る | 1 | 5.34 |
| 支線 | 1 | 6.45 |
| 中佐 | 1 | 4.51 |
| kg | 1 | 4.68 |
| 変わり者 | 1 | 4.45 |
| 美術 | 1 | 4.79 |
| 紳士 | 1 | 3.96 |
| シェフ | 1 | 4.75 |
| 兵隊 | 1 | 4.07 |
| 欲を掻く | 1 | 6.69 |
| 捺印 | 1 | 5.64 |
| 鏡 | 1 | 3.47 |
| 非難 | 1 | 3.84 |
| 事情を話す | 1 | 5.01 |
| お作り | 1 | 4.79 |
| 荒れ地 | 1 | 4.83 |
| 眼福 | 1 | 4.72 |
| ふんだんに | 1 | 4.39 |
| 身重 | 1 | 4.96 |
| くぐもる | 1 | 4.70 |
| 渡航 | 1 | 5.06 |
| 腹ばい | 1 | 5.35 |
| 河川 | 1 | 4.61 |
| ニュースバリュー | 1 | 6.99 |
| ガイド | 1 | 4.53 |
| 研修期間 | 1 | 5.76 |
| ランド | 1 | 3.72 |
| 連射 | 1 | 4.16 |
| ジャンボ機 | 1 | 6.81 |
| ウナギ | 1 | 4.61 |
| 切れ目を入れる | 1 | 6.05 |
| 異変 | 1 | 3.77 |
| デカール | 1 | 6.89 |
| それでもって | 1 | 5.22 |
| 心のどこかで | 1 | 4.55 |
| 朗らか | 1 | 4.06 |
| 撃ち方 | 1 | 5.33 |
| 仕官 | 1 | 4.49 |
| 通達 | 1 | 4.06 |
| 叱る | 1 | 3.72 |
| 心疾患 | 1 | 6.89 |
| 厳格 | 1 | 4.41 |
| 眠らせる | 1 | 4.33 |
| くるくる | 1 | 4.05 |
| 自由行動 | 1 | 4.84 |
| 内争 | 1 | 4.75 |
| 工事現場 | 1 | 5.12 |
| 豪快 | 1 | 3.96 |
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