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 |
|---|---|---|
| 業務 | 3 | 3.94 |
| 請う | 3 | 4.50 |
| 御年 | 3 | 4.88 |
| 新参 | 3 | 4.79 |
| 羊 | 3 | 3.94 |
| 背景 | 3 | 3.95 |
| 行ってらっしゃい | 3 | 4.27 |
| 駿河 | 3 | 3.31 |
| 勉強 | 3 | 3.22 |
| 苛々 | 3 | 4.72 |
| 喜び | 3 | 3.37 |
| じろり | 3 | 5.70 |
| 親しい | 3 | 3.82 |
| 寵愛 | 3 | 4.40 |
| 大人用 | 3 | 5.40 |
| 七十 | 3 | 4.22 |
| 類 | 3 | 3.25 |
| 雷 | 3 | 3.06 |
| 明るい | 3 | 3.19 |
| 妹御 | 3 | 5.52 |
| 召集 | 3 | 4.63 |
| 次ぐ | 3 | 4.21 |
| 残り | 3 | 3.10 |
| 素早い | 3 | 3.27 |
| かと言って | 3 | 3.61 |
| 痛み | 3 | 3.05 |
| 生える | 3 | 3.27 |
| 当日 | 3 | 3.91 |
| 元い | 3 | 4.01 |
| 寛大 | 3 | 4.38 |
| 成っていない | 3 | 3.89 |
| 使嗾 | 3 | 3.46 |
| 関わる | 3 | 3.17 |
| 吹っ飛ぶ | 3 | 3.76 |
| 本当のところ | 3 | 4.68 |
| 司令官 | 3 | 4.00 |
| 大げさ | 3 | 3.96 |
| 触れ | 3 | 3.33 |
| 不味い | 3 | 3.21 |
| 事項 | 3 | 4.04 |
| 残酷 | 3 | 3.87 |
| 二百 | 3 | 3.78 |
| 出向く | 3 | 3.83 |
| 増す | 3 | 3.62 |
| 顔見知り | 3 | 4.10 |
| 戦闘 | 3 | 2.51 |
| 将来 | 3 | 3.44 |
| 複数 | 3 | 3.29 |
| からいって | 3 | 4.79 |
| 反論 | 3 | 3.52 |
| 投げ捨てる | 3 | 4.07 |
| 誤る | 3 | 4.17 |
| お疲れさま | 3 | 4.25 |
| 体高 | 3 | 4.99 |
| 順 | 3 | 4.12 |
| に対し | 3 | 3.21 |
| たら | 3 | 3.78 |
| 取れる | 3 | 3.10 |
| 大切に | 3 | 3.69 |
| 運営 | 3 | 3.53 |
| 損ねる | 3 | 4.06 |
| 保護者 | 3 | 3.96 |
| 布 | 3 | 3.21 |
| 滲む | 3 | 3.60 |
| 愛妻 | 3 | 5.01 |
| 現実 | 3 | 3.06 |
| 争奪 | 3 | 5.61 |
| とさ | 3 | 3.33 |
| そちら | 3 | 3.02 |
| m | 3 | 3.51 |
| 締まる | 3 | 4.71 |
| によると | 3 | 3.63 |
| 言い表す | 3 | 4.80 |
| 奇声 | 3 | 4.34 |
| 大層 | 3 | 4.05 |
| ポンポン | 3 | 4.20 |
| 効能 | 3 | 4.45 |
| 素敵 | 3 | 3.41 |
| 総力戦 | 3 | 4.84 |
| そうは行かない | 3 | 4.69 |
| んー | 3 | 3.43 |
| 幾らでも | 3 | 3.46 |
| 押し掛ける | 3 | 5.28 |
| 警備 | 3 | 3.42 |
| 言い渡す | 3 | 4.37 |
| 先々代 | 3 | 4.78 |
| 火矢 | 3 | 4.57 |
| ピタリ | 3 | 4.18 |
| 頭を下げる | 3 | 3.46 |
| 鳥目 | 3 | 5.93 |
| あい | 3 | 3.89 |
| エンゼル | 3 | 5.83 |
| ぶちのめす | 3 | 4.73 |
| 解釈 | 3 | 3.86 |
| 気付く | 3 | 2.70 |
| 予定通り | 3 | 3.81 |
| 旅 | 3 | 3.10 |
| それはそれで | 3 | 3.69 |
| 披露 | 3 | 3.81 |
| 齟齬 | 3 | 4.55 |
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