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 |
|---|---|---|
| 重厚 | 4 | 4.18 |
| 師匠 | 4 | 3.07 |
| 入り口 | 4 | 3.28 |
| ふふ | 4 | 3.38 |
| 本来なら | 4 | 3.43 |
| その事 | 4 | 3.14 |
| 言い聞かせる | 4 | 3.74 |
| 優美 | 4 | 4.34 |
| 猫舌 | 4 | 5.10 |
| 健康 | 4 | 3.94 |
| どの様に | 4 | 3.74 |
| 尋ね | 4 | 3.43 |
| どちらかと言えば | 4 | 3.93 |
| 伯 | 4 | 3.49 |
| 迷う | 4 | 3.30 |
| 女子 | 4 | 3.33 |
| ええっと | 4 | 4.15 |
| 頑張る | 4 | 3.15 |
| まじか | 4 | 3.76 |
| お時間 | 4 | 4.19 |
| ニヤリ | 4 | 3.76 |
| だけでなく | 4 | 3.27 |
| 蹴り | 4 | 3.23 |
| 認める | 4 | 3.18 |
| いける | 4 | 3.19 |
| 誰一人として | 4 | 4.23 |
| 指揮官 | 4 | 3.53 |
| 戻り | 4 | 3.40 |
| 基準 | 4 | 3.71 |
| 付け加え | 4 | 4.39 |
| お蔭 | 4 | 3.53 |
| 慇懃無礼 | 4 | 5.06 |
| 獅子 | 4 | 3.41 |
| 危うく | 4 | 3.97 |
| 布令 | 4 | 4.84 |
| 鉄格子 | 4 | 4.38 |
| 入浴 | 4 | 4.23 |
| 一晩 | 4 | 3.96 |
| 混乱 | 4 | 3.09 |
| 何にせよ | 4 | 3.96 |
| その代わり | 5 | 3.75 |
| 気まずい | 5 | 3.71 |
| 合わせ | 5 | 3.63 |
| 但し | 5 | 3.11 |
| 高位 | 5 | 3.64 |
| この際 | 5 | 4.02 |
| っぽい | 5 | 3.06 |
| 二日 | 5 | 3.62 |
| 砕く | 5 | 3.46 |
| 五人 | 5 | 3.58 |
| 微笑 | 5 | 3.73 |
| たどり着く | 5 | 3.62 |
| もんだから | 5 | 4.16 |
| お話し | 5 | 3.87 |
| したり | 5 | 3.12 |
| 若しかすると | 5 | 3.71 |
| 申し出 | 5 | 3.74 |
| 片方 | 5 | 3.52 |
| 間もなく | 5 | 3.66 |
| 三百 | 5 | 3.94 |
| のう | 5 | 3.38 |
| 現地 | 5 | 3.87 |
| 内 | 5 | 2.69 |
| 枕元 | 5 | 4.48 |
| どちらも | 5 | 3.51 |
| 起きる | 5 | 2.74 |
| と思ったら | 5 | 3.50 |
| お仕事 | 5 | 3.73 |
| ちゃった | 5 | 3.01 |
| 調子 | 5 | 3.23 |
| 逃げ | 5 | 3.21 |
| 寅 | 5 | 3.74 |
| 羽織る | 5 | 3.89 |
| 苦痛 | 5 | 3.71 |
| 様々 | 5 | 3.02 |
| 矢 | 5 | 2.93 |
| 揃え | 5 | 3.64 |
| 向き合う | 5 | 3.73 |
| 味見 | 5 | 4.12 |
| 衣装部屋 | 5 | 5.54 |
| 空く | 5 | 3.28 |
| 襲いかかる | 5 | 3.59 |
| 何時になく | 5 | 4.31 |
| からかう | 5 | 3.66 |
| 何もない | 5 | 3.46 |
| ならば | 5 | 2.57 |
| 子たち | 5 | 3.93 |
| に限らず | 5 | 4.24 |
| 眠り | 5 | 3.57 |
| 第一 | 5 | 3.13 |
| よっぽど | 5 | 3.76 |
| 着席 | 5 | 4.38 |
| 慣れた | 5 | 3.44 |
| 歩 | 5 | 3.66 |
| 異端 | 5 | 3.26 |
| 透り | 5 | 3.70 |
| べ | 5 | 3.49 |
| 挙げる | 5 | 3.85 |
| 広間 | 5 | 3.65 |
| 気にする | 5 | 3.51 |
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