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 |
|---|---|---|
| 化粧 | 3 | 4.00 |
| 近づき | 3 | 3.85 |
| 場面 | 3 | 3.55 |
| 権力 | 3 | 3.60 |
| 前庭 | 3 | 4.88 |
| お任せ | 3 | 3.86 |
| 成っていない | 3 | 3.89 |
| 孫 | 3 | 3.55 |
| 殲滅 | 3 | 3.62 |
| 第四 | 3 | 3.82 |
| どう見ても | 3 | 3.66 |
| 年下 | 3 | 3.87 |
| お父様 | 3 | 3.32 |
| 独り寝 | 3 | 6.25 |
| 一層 | 3 | 3.84 |
| 布 | 3 | 3.21 |
| 安静 | 3 | 4.48 |
| 分かり | 3 | 3.36 |
| 砂粒 | 3 | 5.07 |
| お水 | 3 | 4.60 |
| 付き添う | 3 | 4.14 |
| 音もなく | 3 | 4.20 |
| 頭を下げる | 3 | 3.46 |
| 奇声 | 3 | 4.34 |
| 上手 | 3 | 3.75 |
| サービス | 3 | 3.92 |
| 覗く | 3 | 3.34 |
| 押し掛ける | 3 | 5.28 |
| バカ騒ぎ | 3 | 5.45 |
| 争奪 | 3 | 5.61 |
| 両脇 | 3 | 4.12 |
| 晒す | 3 | 3.59 |
| 愛 | 3 | 3.07 |
| 旗 | 3 | 3.80 |
| 面白い | 3 | 2.98 |
| 報復 | 3 | 4.00 |
| 厭らしい | 3 | 4.28 |
| 触手 | 3 | 3.56 |
| 剛剣 | 3 | 4.71 |
| 明け透け | 3 | 4.96 |
| 女性関係 | 3 | 5.01 |
| 避け | 3 | 3.12 |
| 派手 | 3 | 3.46 |
| 引き寄せる | 3 | 3.72 |
| がーっと | 3 | 5.65 |
| かもしれん | 3 | 3.52 |
| 役立つ | 3 | 3.89 |
| くっきり | 3 | 4.46 |
| またしても | 3 | 3.96 |
| ぐいぐい | 3 | 4.43 |
| 散歩 | 3 | 3.81 |
| 折れる | 3 | 3.58 |
| と言うことだ | 3 | 3.24 |
| 手伝う | 3 | 3.17 |
| ガタガタ | 3 | 4.31 |
| のみならず | 3 | 3.98 |
| 一時間 | 3 | 3.68 |
| 恵まれる | 3 | 3.79 |
| 湯殿 | 3 | 5.17 |
| 悲しい | 3 | 3.34 |
| 隠れる | 3 | 3.64 |
| 参った | 3 | 4.01 |
| 狼 | 3 | 3.02 |
| 新参 | 3 | 4.79 |
| 殺意 | 3 | 3.71 |
| 野営 | 3 | 3.87 |
| 伎 | 3 | 4.21 |
| 遅れる | 3 | 3.60 |
| 大国 | 3 | 3.76 |
| 迫る | 3 | 3.06 |
| 元素 | 3 | 4.35 |
| 聞き | 3 | 3.08 |
| 惣社 | 3 | 3.37 |
| 乱暴 | 3 | 3.73 |
| 知り合う | 3 | 4.06 |
| おかず | 3 | 4.30 |
| 勇気 | 3 | 3.56 |
| 言い表す | 3 | 4.80 |
| 序 | 3 | 3.94 |
| 確かめ | 3 | 3.70 |
| 雌雄同体 | 3 | 6.08 |
| 愛情 | 3 | 3.79 |
| 数え | 3 | 3.89 |
| 喜び | 3 | 3.37 |
| 親切 | 3 | 4.00 |
| 獲物 | 3 | 3.35 |
| 最下位 | 3 | 4.60 |
| 駿河 | 3 | 3.31 |
| 縁者 | 3 | 4.82 |
| 所作 | 3 | 4.22 |
| 常 | 3 | 3.15 |
| 最強 | 3 | 3.25 |
| 移る | 3 | 3.53 |
| m | 3 | 3.51 |
| 美青年 | 3 | 4.77 |
| ナンバーワン | 3 | 4.86 |
| すんなり | 3 | 4.06 |
| 防御 | 3 | 3.09 |
| 動向 | 3 | 4.00 |
| 小部屋 | 3 | 4.14 |
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