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 |
|---|---|---|
| 広げる | 5 | 3.18 |
| ことになっている | 5 | 3.71 |
| 寄せ | 5 | 3.32 |
| べ | 5 | 3.49 |
| 若しかすると | 5 | 3.71 |
| 感覚 | 5 | 2.95 |
| 敵 | 5 | 2.44 |
| 残る | 5 | 2.71 |
| 機嫌 | 5 | 3.63 |
| その代わり | 5 | 3.75 |
| 直す | 5 | 3.51 |
| 綺麗 | 5 | 2.92 |
| 間もなく | 5 | 3.66 |
| 疑問 | 5 | 2.92 |
| 妙 | 5 | 3.13 |
| きっかけ | 5 | 3.69 |
| 面識 | 5 | 4.07 |
| やり | 5 | 3.43 |
| がっかり | 5 | 4.15 |
| 襲いかかる | 5 | 3.59 |
| お兄ちゃん | 5 | 3.29 |
| 顔ぶれ | 5 | 4.29 |
| どうでも良い | 5 | 3.51 |
| 降り立つ | 5 | 4.08 |
| 怖 | 5 | 3.84 |
| 子爵 | 5 | 3.28 |
| 果たす | 5 | 3.42 |
| 十人 | 5 | 3.89 |
| 片方 | 5 | 3.52 |
| 現地 | 5 | 3.87 |
| さり気 | 5 | 3.88 |
| 察し | 5 | 3.45 |
| 佐賀 | 5 | 3.23 |
| 幾らか | 5 | 3.77 |
| あの娘 | 5 | 4.04 |
| 何時になく | 5 | 4.31 |
| 喋る | 5 | 3.37 |
| 組み | 5 | 3.74 |
| 同時に | 5 | 2.65 |
| 対 | 5 | 3.38 |
| 時点 | 5 | 3.13 |
| 使える | 5 | 2.62 |
| 邪 | 5 | 3.68 |
| お願いだから | 5 | 4.33 |
| 器用 | 5 | 3.03 |
| 光る | 5 | 3.26 |
| 生む | 5 | 3.81 |
| 居間 | 5 | 4.07 |
| 端 | 5 | 3.22 |
| 合わせて | 5 | 3.08 |
| と共に | 5 | 2.60 |
| 何人 | 5 | 3.88 |
| 中庭 | 5 | 3.72 |
| 譲る | 5 | 3.54 |
| うわあ | 5 | 4.03 |
| とすると | 5 | 3.56 |
| 収まる | 5 | 3.44 |
| 微笑 | 5 | 3.73 |
| 進言 | 5 | 4.10 |
| 探索 | 5 | 3.12 |
| 困った | 5 | 3.27 |
| 時期 | 5 | 3.35 |
| 自由時間 | 5 | 4.67 |
| いつの間にか | 5 | 3.19 |
| したり | 5 | 3.12 |
| 前回 | 5 | 3.44 |
| 置き | 5 | 3.70 |
| ならば | 5 | 2.57 |
| 矢 | 5 | 2.93 |
| おかしな | 5 | 3.53 |
| 穏やか | 5 | 3.23 |
| 気まずい | 5 | 3.71 |
| 飲ませる | 5 | 4.55 |
| となると | 5 | 3.16 |
| 羽織る | 5 | 3.89 |
| 体質 | 5 | 4.04 |
| よこす | 5 | 4.27 |
| 近寄る | 5 | 3.45 |
| よっぽど | 5 | 3.76 |
| 甘い | 5 | 3.09 |
| 行ってくる | 5 | 3.79 |
| 何一つ | 5 | 3.88 |
| 蛇 | 5 | 3.25 |
| ピンク | 5 | 3.89 |
| 一歩 | 5 | 3.21 |
| 価値 | 5 | 3.23 |
| 根拠 | 5 | 3.89 |
| 成長 | 5 | 3.04 |
| 同じよう | 5 | 3.06 |
| 申し訳ない | 5 | 3.42 |
| 寄せる | 5 | 3.71 |
| 以後 | 5 | 4.10 |
| お酒 | 5 | 3.70 |
| 柔らかい | 5 | 3.35 |
| に限らず | 5 | 4.24 |
| 銀 | 5 | 3.11 |
| 招く | 5 | 3.49 |
| 四位 | 5 | 4.87 |
| 備え | 5 | 3.71 |
| そんな風に | 5 | 3.28 |
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