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 |
|---|---|---|
| 貨幣 | 3 | 4.19 |
| 行ってらっしゃい | 3 | 4.27 |
| 当日 | 3 | 3.91 |
| おっちゃん | 3 | 3.89 |
| まとめて | 3 | 3.56 |
| 見惚れる | 3 | 4.04 |
| 口にする | 3 | 3.30 |
| ぼうっと | 3 | 4.41 |
| 主な | 3 | 3.97 |
| 凄い | 3 | 2.72 |
| 寛大 | 3 | 4.38 |
| 参った | 3 | 4.01 |
| 為 | 3 | 2.86 |
| 姫君 | 3 | 3.95 |
| 引っ込み思案 | 3 | 4.96 |
| この辺り | 3 | 3.42 |
| 反論 | 3 | 3.52 |
| んー | 3 | 3.43 |
| 投げ捨てる | 3 | 4.07 |
| 仰々しい | 3 | 4.56 |
| その物 | 3 | 3.04 |
| 甘いもの | 3 | 4.26 |
| 臨む | 3 | 4.12 |
| 年下 | 3 | 3.87 |
| 戴き | 3 | 3.44 |
| 励む | 3 | 3.90 |
| 失敗 | 3 | 3.02 |
| 刻む | 3 | 3.37 |
| あるらしい | 3 | 3.61 |
| 三回 | 3 | 4.07 |
| 見渡す | 3 | 3.63 |
| 強調 | 3 | 4.04 |
| 波乱 | 3 | 4.38 |
| にて | 3 | 3.20 |
| 勝手 | 3 | 3.66 |
| 四本 | 3 | 4.21 |
| 飛ばし | 3 | 3.48 |
| 確かめ | 3 | 3.70 |
| 引き取る | 3 | 3.89 |
| 醜聞 | 3 | 4.58 |
| 人たち | 3 | 3.20 |
| 争覇 | 3 | 3.62 |
| 有様 | 3 | 3.84 |
| 殿方 | 3 | 4.17 |
| 脚 | 3 | 3.41 |
| 反対意見 | 3 | 4.74 |
| キャットファイト | 3 | 5.69 |
| 奇妙 | 3 | 3.51 |
| 逃れ | 3 | 3.96 |
| 一目 | 3 | 3.72 |
| 野望 | 3 | 4.28 |
| 見送り | 3 | 3.75 |
| ままに | 3 | 3.37 |
| 一端 | 3 | 4.01 |
| 乱戦 | 3 | 4.25 |
| 縁者 | 3 | 4.82 |
| 残り | 3 | 3.10 |
| ナイス | 3 | 4.22 |
| 切っ先 | 3 | 3.89 |
| 持てる | 3 | 3.58 |
| べらべら | 3 | 4.86 |
| 幸せ | 3 | 2.99 |
| それはない | 3 | 4.11 |
| 鮫 | 3 | 4.45 |
| あまつさえ | 3 | 4.46 |
| に対し | 3 | 3.21 |
| 艶 | 3 | 3.84 |
| 左 | 3 | 3.28 |
| 下世話 | 3 | 4.94 |
| からに | 3 | 3.79 |
| 払う | 3 | 3.23 |
| 上司 | 3 | 3.74 |
| 抱える | 3 | 3.47 |
| 連中 | 3 | 2.86 |
| 追って | 3 | 3.40 |
| 近づける | 3 | 3.66 |
| 関わる | 3 | 3.17 |
| 種 | 3 | 2.95 |
| 身近 | 3 | 3.99 |
| 内的 | 3 | 5.66 |
| 背もたれ | 3 | 4.31 |
| 旅 | 3 | 3.10 |
| 騒ぎ | 3 | 3.37 |
| 出発 | 3 | 3.26 |
| 黄色い | 3 | 3.95 |
| ご無沙汰 | 3 | 4.40 |
| 暗殺者 | 3 | 3.69 |
| 待った | 3 | 3.67 |
| とさ | 3 | 3.33 |
| 押し掛ける | 3 | 5.28 |
| 客 | 3 | 3.29 |
| 解析 | 3 | 3.69 |
| 睨みつける | 3 | 3.53 |
| 捕らえる | 3 | 3.56 |
| すんなり | 3 | 4.06 |
| 面々 | 3 | 3.25 |
| 会議場 | 3 | 4.83 |
| 絡む | 3 | 3.49 |
| いざ | 3 | 3.58 |
| お願いいたします | 3 | 4.16 |
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