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 |
|---|---|---|
| 泣き崩れる | 1 | 4.64 |
| 富む | 1 | 4.22 |
| 一棟 | 1 | 5.48 |
| 形見 | 1 | 4.58 |
| 又 | 1 | 4.06 |
| 臣民 | 1 | 4.51 |
| 五臓六腑 | 1 | 5.69 |
| 首根っこ | 1 | 4.38 |
| 夜食 | 1 | 4.70 |
| 死後 | 1 | 4.22 |
| おくれ | 1 | 4.62 |
| 絶望的 | 1 | 3.94 |
| 本物 | 1 | 3.31 |
| 口に入る | 1 | 5.37 |
| 暖かい | 1 | 3.67 |
| メイン | 1 | 3.56 |
| お見知りおき | 1 | 4.69 |
| ボウル | 1 | 4.64 |
| 裏切る | 1 | 3.46 |
| ぴしっと | 1 | 5.29 |
| 光線 | 1 | 4.00 |
| でなければいけない | 1 | 5.39 |
| 着衣 | 1 | 4.95 |
| ストップ | 1 | 4.24 |
| どこの馬の骨 | 1 | 5.00 |
| 傷手 | 1 | 4.57 |
| 事務的 | 1 | 4.59 |
| つま先立ち | 1 | 5.60 |
| 何日も | 1 | 4.36 |
| 火 | 1 | 2.74 |
| お熱 | 1 | 5.73 |
| 一際 | 1 | 3.81 |
| 仲が良い | 1 | 4.21 |
| おずおず | 1 | 4.04 |
| わくわく | 1 | 4.27 |
| 事典 | 1 | 5.42 |
| 世襲制 | 1 | 5.46 |
| 丈夫 | 1 | 3.94 |
| 婚約者 | 1 | 3.09 |
| もぐ | 1 | 4.36 |
| 外壁 | 1 | 4.02 |
| プレッシャーを掛ける | 1 | 5.61 |
| 気質 | 1 | 4.16 |
| 出くわす | 1 | 4.10 |
| 位相 | 1 | 4.30 |
| かけ離れる | 1 | 4.28 |
| 文字 | 1 | 3.20 |
| それきり | 1 | 4.75 |
| 数度 | 1 | 4.32 |
| やたらめったら | 1 | 5.41 |
| 怪しむ | 1 | 4.09 |
| ふわり | 1 | 3.82 |
| 書き物机 | 1 | 5.74 |
| 横殴り | 1 | 4.84 |
| 定例 | 1 | 5.00 |
| 為る | 1 | 4.98 |
| 封じる | 1 | 3.58 |
| 重点的 | 1 | 4.63 |
| 見通す | 1 | 4.46 |
| 当代 | 1 | 4.42 |
| ぼろぼろ | 1 | 4.26 |
| 修行 | 1 | 3.46 |
| 方円 | 1 | 5.91 |
| ぐるぐる | 1 | 4.01 |
| 忍ぶ | 1 | 4.41 |
| 滅びる | 1 | 3.74 |
| 難い | 1 | 3.79 |
| し合う | 1 | 4.30 |
| クラス | 1 | 3.02 |
| そやつ | 1 | 4.83 |
| 引かれる | 1 | 4.40 |
| にも拘わらず | 1 | 4.74 |
| 出端 | 1 | 4.63 |
| たちが良い | 1 | 5.86 |
| 羽ペン | 1 | 4.76 |
| だけしか | 1 | 4.22 |
| チョコレートケーキ | 1 | 5.33 |
| 同然 | 1 | 3.78 |
| 境 | 1 | 4.09 |
| 吹き出し | 1 | 4.17 |
| 散打 | 1 | 3.67 |
| 発送 | 1 | 5.51 |
| 恋い焦がれる | 1 | 5.23 |
| 猶予 | 1 | 4.18 |
| 仰せ | 1 | 4.39 |
| 欲しいだけ | 1 | 4.81 |
| 回す | 1 | 3.47 |
| 一から | 1 | 4.17 |
| 順位 | 1 | 4.23 |
| 慎ましやか | 1 | 4.95 |
| プッツン | 1 | 5.70 |
| 丸一日 | 1 | 4.40 |
| 挿入 | 1 | 5.05 |
| ダン | 1 | 3.65 |
| シングル | 1 | 5.06 |
| もどかしい | 1 | 4.26 |
| 転ぶ | 1 | 3.77 |
| 不誠実 | 1 | 4.78 |
| 恥じらい | 1 | 4.68 |
| て言うか | 1 | 3.79 |
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