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 |
|---|---|---|
| 同位 | 5 | 5.65 |
| そりゃ | 5 | 3.16 |
| 引っ張る | 5 | 3.35 |
| 有無 | 5 | 4.00 |
| 年上 | 5 | 3.70 |
| 幾らか | 5 | 3.77 |
| 同行 | 5 | 3.40 |
| ならともかく | 5 | 3.89 |
| 片方 | 5 | 3.52 |
| 全軍 | 5 | 4.05 |
| 一斉に | 5 | 3.36 |
| 着く | 5 | 3.05 |
| 付ける | 5 | 3.02 |
| 持ち上げる | 5 | 3.40 |
| 甘い | 5 | 3.09 |
| なんてこと | 5 | 3.56 |
| 真っ直ぐ | 5 | 3.17 |
| 促す | 5 | 3.30 |
| むき出し | 5 | 4.23 |
| 組み | 5 | 3.74 |
| クッキー | 5 | 3.81 |
| 向き合う | 5 | 3.73 |
| 射抜く | 5 | 4.13 |
| 思想 | 5 | 4.04 |
| ものですから | 5 | 4.17 |
| ろ | 5 | 3.70 |
| 形 | 4 | 2.70 |
| 助けて | 4 | 3.13 |
| 跡地 | 4 | 4.53 |
| たん | 4 | 3.48 |
| 定項 | 4 | 3.84 |
| 侍る | 4 | 4.04 |
| 調べ | 4 | 3.20 |
| 治す | 4 | 3.52 |
| 呼びつける | 4 | 4.39 |
| 誰一人として | 4 | 4.23 |
| 告げる | 4 | 2.80 |
| 目眩 | 4 | 4.39 |
| 遮る | 4 | 3.43 |
| ぞっと | 4 | 4.26 |
| 今にも | 4 | 3.62 |
| 合う | 4 | 2.87 |
| 起立 | 4 | 4.95 |
| ぎゅっと | 4 | 3.79 |
| 命令 | 4 | 3.05 |
| ちらちら | 4 | 4.22 |
| 気安い | 4 | 4.05 |
| 無かろう | 4 | 3.79 |
| 系 | 4 | 2.92 |
| 応用 | 4 | 3.85 |
| 大切 | 4 | 3.25 |
| 引き起こす | 4 | 3.81 |
| 獅子 | 4 | 3.41 |
| 越える | 4 | 3.59 |
| 歴代 | 4 | 4.13 |
| と同じように | 4 | 3.34 |
| 丸薬 | 4 | 4.84 |
| 肘掛け | 4 | 5.05 |
| 名子 | 4 | 4.16 |
| 古謡 | 4 | 3.99 |
| 豪華 | 4 | 3.71 |
| ただ今 | 4 | 3.64 |
| ぐるみ | 4 | 4.72 |
| 従って | 4 | 3.83 |
| 妖艶 | 4 | 4.23 |
| そこから | 4 | 3.10 |
| 四日 | 4 | 3.94 |
| 衛兵 | 4 | 3.62 |
| 味わう | 4 | 3.58 |
| さっぱり | 4 | 3.62 |
| 各 | 4 | 3.30 |
| ニ | 4 | 4.21 |
| 囁く | 4 | 3.56 |
| 争奪戦 | 4 | 4.63 |
| 貫く | 4 | 3.25 |
| 邪推 | 4 | 4.70 |
| 取っ | 4 | 3.00 |
| ちらっと | 4 | 4.31 |
| 脅す | 4 | 4.00 |
| 傾ける | 4 | 3.62 |
| 弱々しい | 4 | 4.04 |
| オタオタ | 4 | 5.79 |
| ふと | 4 | 3.07 |
| こそこそ | 4 | 4.24 |
| どちらか | 4 | 3.67 |
| 本来 | 4 | 3.09 |
| じりじり | 4 | 4.23 |
| 驚愕 | 4 | 3.40 |
| 破れ | 4 | 4.25 |
| 訴え | 4 | 3.74 |
| もて | 4 | 4.27 |
| 暴走 | 4 | 3.42 |
| 情報収集 | 4 | 3.71 |
| 物騒 | 4 | 3.84 |
| ストレス | 4 | 3.94 |
| 見送る | 4 | 3.37 |
| 昼 | 4 | 3.52 |
| 嫌悪 | 4 | 4.09 |
| 淡々 | 4 | 3.61 |
| 仕丁 | 4 | 3.25 |
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