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 |
|---|---|---|
| 何事か | 3 | 3.83 |
| 舌打ち | 3 | 3.62 |
| ぼうっと | 3 | 4.41 |
| 口出し | 3 | 4.21 |
| 兄上 | 3 | 3.54 |
| いつも通り | 3 | 3.43 |
| 罰 | 3 | 3.70 |
| 効能 | 3 | 4.45 |
| ぞろぞろ | 3 | 4.26 |
| 美形 | 3 | 4.02 |
| 昔 | 3 | 2.93 |
| あれから | 3 | 3.70 |
| 姫君 | 3 | 3.95 |
| 今となっては | 3 | 3.99 |
| 痛み | 3 | 3.05 |
| 過ぎ | 3 | 3.12 |
| 予定通り | 3 | 3.81 |
| 赤ん坊 | 3 | 3.86 |
| 面々 | 3 | 3.25 |
| 他用 | 3 | 4.13 |
| 三男 | 3 | 4.09 |
| 飛んで | 3 | 3.00 |
| 務め | 3 | 3.69 |
| 披露 | 3 | 3.81 |
| 砂粒 | 3 | 5.07 |
| 分かり | 3 | 3.36 |
| キャットファイト | 3 | 5.69 |
| 叙爵 | 3 | 4.87 |
| 表 | 3 | 3.47 |
| 二百 | 3 | 3.78 |
| 理想 | 3 | 3.63 |
| 七人 | 3 | 4.21 |
| 保護者 | 3 | 3.96 |
| ビクリと | 3 | 4.51 |
| 勉強 | 3 | 3.22 |
| だり | 3 | 3.41 |
| べらべら | 3 | 4.86 |
| 屋根 | 3 | 3.56 |
| 隠し | 3 | 3.04 |
| 憎い | 3 | 3.93 |
| 何れも | 3 | 3.39 |
| 背景 | 3 | 3.95 |
| 最適 | 3 | 3.96 |
| 育つ | 3 | 3.40 |
| 声をあげる | 3 | 4.00 |
| そちら | 3 | 3.02 |
| 読み | 3 | 3.20 |
| 天辺 | 3 | 4.18 |
| 殴り合い | 3 | 4.41 |
| 特訓 | 3 | 3.95 |
| その物 | 3 | 3.04 |
| 主義 | 3 | 4.28 |
| えー | 3 | 3.52 |
| 年頃 | 3 | 3.81 |
| 道 | 3 | 2.74 |
| 隙 | 3 | 3.12 |
| 微笑み | 3 | 3.30 |
| 未だに | 3 | 3.45 |
| 野望 | 3 | 4.28 |
| 叫び声 | 3 | 3.71 |
| 強制 | 3 | 3.79 |
| 一家 | 3 | 3.91 |
| 問いただす | 3 | 4.34 |
| 末に | 3 | 4.03 |
| 何時でも | 3 | 3.33 |
| 第六 | 3 | 4.18 |
| 客 | 3 | 3.29 |
| 大げさ | 3 | 3.96 |
| 一瞥 | 3 | 3.77 |
| 身長 | 3 | 3.45 |
| すんなり | 3 | 4.06 |
| 誠実 | 3 | 4.09 |
| それよりも | 3 | 3.35 |
| 常 | 3 | 3.15 |
| 摸する | 3 | 3.34 |
| 重臣 | 3 | 4.25 |
| 上着 | 3 | 3.94 |
| 選択肢 | 3 | 3.42 |
| いざ | 3 | 3.58 |
| 報復 | 3 | 4.00 |
| 引き取る | 3 | 3.89 |
| 最高 | 3 | 3.21 |
| 若君 | 3 | 4.88 |
| 噂話 | 3 | 4.18 |
| 力押し | 3 | 4.54 |
| 二部 | 3 | 5.08 |
| 大挙 | 3 | 4.82 |
| 上手く | 3 | 2.88 |
| バカ騒ぎ | 3 | 5.45 |
| 一種 | 3 | 3.64 |
| 後半 | 3 | 3.77 |
| 翌日 | 3 | 3.38 |
| 腰を折る | 3 | 5.29 |
| 一生 | 3 | 3.60 |
| じゃが | 3 | 3.56 |
| 個室 | 3 | 4.02 |
| クッション | 3 | 4.09 |
| 寝台 | 3 | 3.85 |
| 真っ黒 | 3 | 3.92 |
| それはそれで | 3 | 3.69 |
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