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 |
|---|---|---|
| ナイス | 3 | 4.22 |
| 他愛のない | 3 | 4.75 |
| 本能的 | 3 | 4.09 |
| 帰ってくる | 3 | 3.74 |
| 愚か | 3 | 3.48 |
| 一人として | 3 | 4.36 |
| べらべら | 3 | 4.86 |
| 脱兎のごとく | 3 | 5.04 |
| 面々 | 3 | 3.25 |
| ご自身 | 3 | 4.42 |
| 年頃 | 3 | 3.81 |
| よく考えたら | 3 | 4.56 |
| この辺り | 3 | 3.42 |
| 齟齬 | 3 | 4.55 |
| 口出し | 3 | 4.21 |
| 背の高い | 3 | 4.18 |
| 突っこみ | 3 | 4.74 |
| 精神的 | 3 | 3.59 |
| 飛ぶ | 3 | 3.33 |
| 金 | 3 | 2.82 |
| 関与 | 3 | 4.10 |
| 壁際 | 3 | 3.99 |
| 序 | 3 | 3.94 |
| 腹部 | 3 | 3.87 |
| 気遣い | 3 | 3.79 |
| 執務 | 3 | 4.04 |
| 数え | 3 | 3.89 |
| 明るい | 3 | 3.19 |
| 憎い | 3 | 3.93 |
| 複数 | 3 | 3.29 |
| ついて行く | 3 | 3.82 |
| 寵愛 | 3 | 4.40 |
| 警備 | 3 | 3.42 |
| きっぱり | 3 | 4.05 |
| ごと | 3 | 3.29 |
| 三位 | 3 | 4.56 |
| 躊躇い | 3 | 3.91 |
| お父様 | 3 | 3.32 |
| 姫君 | 3 | 3.95 |
| 気付く | 3 | 2.70 |
| 午前 | 3 | 3.84 |
| 隊列 | 3 | 4.05 |
| によると | 3 | 3.63 |
| エンゼル | 3 | 5.83 |
| 解決 | 3 | 3.27 |
| イラッと | 3 | 4.57 |
| その物 | 3 | 3.04 |
| 事項 | 3 | 4.04 |
| プライド | 3 | 3.80 |
| 引き下がる | 3 | 4.06 |
| ドキドキ | 3 | 3.90 |
| 様になる | 3 | 3.45 |
| 飛び抜ける | 3 | 4.59 |
| 退出 | 3 | 4.16 |
| 緑 | 3 | 3.32 |
| 逃れ | 3 | 3.96 |
| 万 | 3 | 3.12 |
| 瞬く | 3 | 3.86 |
| 恵まれる | 3 | 3.79 |
| に対し | 3 | 3.21 |
| 有能 | 3 | 3.85 |
| 不案内 | 3 | 5.72 |
| 怯える | 3 | 3.71 |
| じゃれ付く | 3 | 5.40 |
| 反撃 | 3 | 3.52 |
| 投げる | 3 | 3.49 |
| おかず | 3 | 4.30 |
| 司令官 | 3 | 4.00 |
| 出発 | 3 | 3.26 |
| 刺繍 | 3 | 3.90 |
| 移る | 3 | 3.53 |
| そうしたら | 3 | 3.96 |
| 視 | 3 | 3.90 |
| 波乱 | 3 | 4.38 |
| 娘さん | 3 | 3.99 |
| お兄さん | 3 | 3.58 |
| ぼうっと | 3 | 4.41 |
| 訪問先 | 3 | 5.63 |
| あまつさえ | 3 | 4.46 |
| ハハハ | 3 | 4.14 |
| プルプル | 3 | 4.34 |
| 左 | 3 | 3.28 |
| 通し | 3 | 3.74 |
| 常 | 3 | 3.15 |
| 今頃 | 3 | 3.74 |
| 習慣 | 3 | 4.05 |
| 勝手 | 3 | 3.66 |
| やり方 | 3 | 3.52 |
| 上手 | 3 | 3.75 |
| 害する | 3 | 4.39 |
| 手加減 | 3 | 3.71 |
| 愛情 | 3 | 3.79 |
| 御年 | 3 | 4.88 |
| 顔見知り | 3 | 4.10 |
| サービス | 3 | 3.92 |
| えー | 3 | 3.52 |
| 殺意 | 3 | 3.71 |
| 上司 | 3 | 3.74 |
| 治る | 3 | 3.61 |
| 戦闘 | 3 | 2.51 |
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