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 |
|---|---|---|
| 知れる | 6 | 3.41 |
| 吹っ | 6 | 3.29 |
| バレる | 6 | 3.43 |
| 固まる | 6 | 3.33 |
| 加わる | 6 | 3.42 |
| そこで | 6 | 2.74 |
| 喧噪 | 6 | 4.66 |
| かどうか | 6 | 3.06 |
| だっけ | 6 | 3.76 |
| 訪れ | 6 | 3.72 |
| 努力 | 6 | 3.28 |
| 急 | 6 | 3.79 |
| どうしても | 6 | 3.16 |
| 話をする | 6 | 3.66 |
| お部屋 | 6 | 4.13 |
| 振り向く | 6 | 3.32 |
| 固い | 6 | 3.50 |
| 美味しい | 6 | 2.91 |
| にしても | 6 | 3.12 |
| 中でも | 6 | 3.22 |
| 左派 | 6 | 3.44 |
| 母親 | 6 | 3.18 |
| ちっ | 6 | 3.66 |
| 最低 | 6 | 3.50 |
| 重い | 6 | 3.10 |
| 教える | 6 | 3.17 |
| 挑発 | 6 | 3.71 |
| 蓋 | 6 | 3.70 |
| 下僕 | 6 | 4.24 |
| 予備 | 6 | 3.73 |
| 基本的に | 6 | 3.18 |
| やり取り | 6 | 3.21 |
| 正座 | 6 | 4.08 |
| 分析 | 6 | 3.75 |
| 鼻 | 6 | 3.23 |
| 仕掛 | 6 | 4.20 |
| かよ | 5 | 3.36 |
| 生む | 5 | 3.81 |
| よっぽど | 5 | 3.76 |
| 手紙 | 5 | 3.07 |
| 持ち上げる | 5 | 3.40 |
| 様々 | 5 | 3.02 |
| 不気味 | 5 | 3.60 |
| 市ね | 5 | 3.36 |
| 光る | 5 | 3.26 |
| 細君 | 5 | 5.14 |
| クッキー | 5 | 3.81 |
| 試す | 5 | 3.51 |
| 住む | 5 | 3.05 |
| お兄ちゃん | 5 | 3.29 |
| 治世 | 5 | 4.63 |
| か弱い | 5 | 4.28 |
| 同位 | 5 | 5.65 |
| 要するに | 5 | 3.62 |
| 真円 | 5 | 5.20 |
| 犯人 | 5 | 3.57 |
| 気を使う | 5 | 4.60 |
| 向き合う | 5 | 3.73 |
| 自由 | 5 | 3.33 |
| ならば | 5 | 2.57 |
| お酒 | 5 | 3.70 |
| 座り | 5 | 3.58 |
| 睨む | 5 | 3.25 |
| 梃 | 5 | 3.64 |
| 子爵 | 5 | 3.28 |
| だらし | 5 | 4.47 |
| レース | 5 | 3.92 |
| 降り立つ | 5 | 4.08 |
| けども | 5 | 3.93 |
| ケーキ | 5 | 3.68 |
| 人物 | 5 | 2.80 |
| 広間 | 5 | 3.65 |
| 手織 | 5 | 2.80 |
| 何だと | 5 | 3.45 |
| 元へ | 5 | 3.46 |
| お中 | 5 | 4.18 |
| 呼び | 5 | 3.57 |
| がっかり | 5 | 4.15 |
| どうしたん | 5 | 3.53 |
| 隠れ | 5 | 3.31 |
| 出てくる | 5 | 3.14 |
| 五日 | 5 | 3.24 |
| 邪 | 5 | 3.68 |
| やがて | 5 | 3.09 |
| 機嫌 | 5 | 3.63 |
| 一位 | 5 | 4.21 |
| して遣る | 5 | 3.56 |
| 白々しい | 5 | 4.50 |
| 襲いかかる | 5 | 3.59 |
| なんてこと | 5 | 3.56 |
| 行ってくる | 5 | 3.79 |
| 浴びる | 5 | 3.52 |
| やり | 5 | 3.43 |
| いつの間にか | 5 | 3.19 |
| あの娘 | 5 | 4.04 |
| 下手 | 5 | 3.26 |
| 見守る | 5 | 3.22 |
| 居間 | 5 | 4.07 |
| 前回 | 5 | 3.44 |
| 飲ませる | 5 | 4.55 |
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