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 |
|---|---|---|
| 下元 | 1 | 5.83 |
| 頼もう | 1 | 4.48 |
| 代わり | 1 | 3.62 |
| 笑い声 | 1 | 3.54 |
| 戦陣 | 1 | 5.50 |
| 割り込む | 1 | 3.90 |
| 海 | 1 | 2.90 |
| 未使用品 | 1 | 6.45 |
| 一心不乱 | 1 | 4.47 |
| 口ごもる | 1 | 4.37 |
| 供 | 1 | 4.23 |
| 結婚相手 | 1 | 4.32 |
| 通路 | 1 | 3.23 |
| 最下層 | 1 | 4.20 |
| 辞さない | 1 | 4.92 |
| この場合 | 1 | 3.78 |
| 体調を崩す | 1 | 5.03 |
| 防戦一方 | 1 | 4.61 |
| ツイン | 1 | 4.85 |
| あきれ顔 | 1 | 5.32 |
| 手放す | 1 | 3.83 |
| 対処方法 | 1 | 5.02 |
| 貸す | 1 | 3.91 |
| かっけー | 1 | 5.66 |
| 食らう | 1 | 3.56 |
| 平原 | 1 | 3.73 |
| 三倍 | 1 | 4.20 |
| 其れ | 1 | 4.18 |
| お互い様 | 1 | 4.45 |
| ゴロツキ | 1 | 4.62 |
| 席に着く | 1 | 4.48 |
| 名前だけ | 1 | 4.34 |
| 踵を返す | 1 | 4.55 |
| 満足のいく | 1 | 4.93 |
| いい気 | 1 | 4.72 |
| 早急 | 1 | 4.06 |
| 地位を得る | 1 | 5.69 |
| 嗜好 | 1 | 4.59 |
| これと言って | 1 | 4.47 |
| 言 | 1 | 3.66 |
| 匂わせる | 1 | 4.62 |
| 口振り | 1 | 4.66 |
| お見知りおき | 1 | 4.69 |
| 名礼 | 1 | 3.69 |
| 煽てる | 1 | 5.58 |
| 他所 | 1 | 3.65 |
| 待遇 | 1 | 4.10 |
| ムスっと | 1 | 5.88 |
| 長袖 | 1 | 4.78 |
| 四六時中 | 1 | 4.62 |
| 祝い | 1 | 4.04 |
| 漏れる | 1 | 3.55 |
| べったり | 1 | 4.42 |
| 些し | 1 | 3.99 |
| 結婚式 | 1 | 3.69 |
| 効果てきめん | 1 | 5.78 |
| 奪還 | 1 | 3.97 |
| 婚約者 | 1 | 3.09 |
| 崩れる | 1 | 3.63 |
| 害 | 1 | 3.94 |
| 暴虐 | 1 | 4.45 |
| 守り | 1 | 3.46 |
| 声量 | 1 | 4.55 |
| 往復 | 1 | 4.05 |
| 顔面 | 1 | 3.59 |
| 毛嫌い | 1 | 4.75 |
| つかの間 | 1 | 4.74 |
| ピーク | 1 | 4.67 |
| 先手 | 1 | 4.22 |
| 足を止める | 1 | 4.17 |
| 管理官 | 1 | 4.38 |
| 蹄 | 1 | 4.48 |
| 悟り | 1 | 4.34 |
| 位相 | 1 | 4.30 |
| 細長い | 1 | 4.13 |
| 正確に言うと | 1 | 4.89 |
| 引き締め | 1 | 4.07 |
| 筒 | 1 | 4.06 |
| 仮眠 | 1 | 4.51 |
| 手がかり | 1 | 4.18 |
| 半ば | 1 | 3.39 |
| はみ出し | 1 | 4.95 |
| 〇 | 1 | 3.31 |
| 狐 | 1 | 3.42 |
| うまいこと | 1 | 4.68 |
| 家庭料理 | 1 | 5.20 |
| 若さ | 1 | 4.16 |
| 居たたまれない | 1 | 4.67 |
| つま先立ち | 1 | 5.60 |
| 倒 | 1 | 4.46 |
| 許容 | 1 | 4.09 |
| 自宅 | 1 | 3.82 |
| 大恩 | 1 | 4.92 |
| 即時 | 1 | 4.55 |
| 人材 | 1 | 3.62 |
| 無名 | 1 | 4.58 |
| 事務 | 1 | 4.39 |
| 裏切る | 1 | 3.46 |
| うずうず | 1 | 4.74 |
| 書き入れ時 | 1 | 6.06 |
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