Ja'iru was nothing more than an unremarkable demon clan baron, but due to a minor accident, he ended up defeating one of the Grand Dukes second only to the Demon King, and found himself taking over that position. This is the story of Ja'iru's first and second years as he aimed to live as peacefully as possible among the demon clan, whose members were mostly muscle-headed. Surrounded by his selfish sister with a brother complex, the most powerful queen, his womanizing best friend, a somewhat perverted Demon King, a strict butler, an expressionless subordinate, and others, Ja'iru's peaceful daily life continued on as always. From the third year onward, I am writing the sequel as "The Peaceful Daily Life of the Demon Clan Grand Duke" → "The Peaceful Daily Life of the Terror Grand Duke."
| Word | Frequency | Difficulty |
|---|---|---|
| 膠 | 1 | 4.77 |
| おかげ様で | 1 | 4.46 |
| 罰する | 1 | 4.55 |
| 従来 | 1 | 4.49 |
| だろうに | 1 | 4.05 |
| お見知りおき | 1 | 4.69 |
| 碌に | 1 | 3.81 |
| 布石 | 1 | 4.56 |
| あわよくば | 1 | 4.49 |
| 職務 | 1 | 4.20 |
| 初回 | 1 | 4.65 |
| 黒焦げ | 1 | 4.74 |
| 何もかも | 1 | 3.55 |
| 秘密 | 1 | 3.31 |
| 六十 | 1 | 4.04 |
| 結婚生活 | 1 | 4.93 |
| へら | 1 | 4.80 |
| 弛緩 | 1 | 4.56 |
| 狎れ狎れしい | 1 | 5.69 |
| 物 | 1 | 2.51 |
| 硬貨 | 1 | 4.31 |
| 屋根瓦 | 1 | 5.69 |
| 無理矢理 | 1 | 3.64 |
| 外側 | 1 | 3.85 |
| お連れ | 1 | 4.27 |
| 過剰反応 | 1 | 5.06 |
| 割合 | 1 | 4.06 |
| 道理で | 1 | 4.11 |
| モヤモヤ | 1 | 4.51 |
| エスカレート | 1 | 4.93 |
| ざ | 1 | 4.59 |
| 心配いらない | 1 | 4.76 |
| 先を急ぐ | 1 | 4.85 |
| 不真面目 | 1 | 4.93 |
| 義母 | 1 | 4.01 |
| 散らばる | 1 | 3.93 |
| 片時も | 1 | 4.95 |
| 断固 | 1 | 4.70 |
| 度合い | 1 | 4.30 |
| 一瞬にして | 1 | 3.88 |
| 王族 | 1 | 3.11 |
| 愛する | 1 | 3.63 |
| 示威行為 | 1 | 5.46 |
| 本体 | 1 | 3.63 |
| 正面きって | 1 | 5.62 |
| 最奥 | 1 | 4.21 |
| 通達 | 1 | 4.06 |
| 得難い | 1 | 4.60 |
| 通常業務 | 1 | 5.05 |
| ふー | 1 | 4.13 |
| しめる | 1 | 4.85 |
| 縫いぐるみ | 1 | 3.93 |
| そうもない | 1 | 4.27 |
| やぶ蛇 | 1 | 5.54 |
| 目を向ける | 1 | 3.73 |
| 約 | 1 | 3.47 |
| やんちゃ | 1 | 4.57 |
| 重点的 | 1 | 4.63 |
| 持ち手 | 1 | 4.57 |
| 毒のある | 1 | 5.45 |
| 歩行 | 1 | 4.47 |
| 狭 | 1 | 4.56 |
| 見極める | 1 | 4.09 |
| 長旅 | 1 | 4.43 |
| 外周 | 1 | 4.30 |
| 完結 | 1 | 4.06 |
| 懐疑的 | 1 | 4.79 |
| 出ていく | 1 | 3.96 |
| 半額 | 1 | 4.80 |
| こぎ着ける | 1 | 5.46 |
| に沿って | 1 | 4.07 |
| キャビネット | 1 | 5.72 |
| 皇 | 1 | 3.24 |
| 王位 | 1 | 4.05 |
| 侮蔑 | 1 | 4.32 |
| 悪魔 | 1 | 3.04 |
| 親しみ深い | 1 | 6.26 |
| ナイーブ | 1 | 5.48 |
| 下準備 | 1 | 4.44 |
| 浮き出る | 1 | 4.66 |
| なるべく早く | 1 | 4.49 |
| バカみたい | 1 | 4.67 |
| 方向転換 | 1 | 4.44 |
| 冷水 | 1 | 4.67 |
| 次いで | 1 | 3.92 |
| 中間 | 1 | 4.21 |
| キョロキョロ | 1 | 4.13 |
| 夢見 | 1 | 4.29 |
| 福利厚生 | 1 | 5.30 |
| 際どい | 1 | 4.62 |
| 奮闘 | 1 | 4.25 |
| ウブ | 1 | 5.42 |
| 一言二言 | 1 | 5.03 |
| 敗因 | 1 | 4.16 |
| お返し | 1 | 4.00 |
| 恋愛 | 1 | 3.65 |
| 薄々 | 1 | 4.22 |
| かき消す | 1 | 4.23 |
| 何れにも | 1 | 5.27 |
| 岩場 | 1 | 3.79 |
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