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 |
|---|---|---|
| 炸裂 | 2 | 3.88 |
| 入室 | 2 | 4.07 |
| 膨大 | 2 | 3.67 |
| 不要 | 2 | 3.70 |
| 通知 | 2 | 4.53 |
| 事務方 | 2 | 5.19 |
| 解く | 2 | 3.30 |
| 貰い | 2 | 3.44 |
| 友達づきあい | 2 | 6.43 |
| 試みる | 2 | 3.89 |
| にやにや | 2 | 4.25 |
| いいや | 2 | 3.63 |
| 訳ではない | 2 | 3.38 |
| 勇敢 | 2 | 4.28 |
| くらいなら | 2 | 3.63 |
| ねね | 2 | 4.55 |
| 機嫌が悪い | 2 | 4.80 |
| 知るか | 2 | 4.35 |
| がっしり | 2 | 4.26 |
| 出し手 | 2 | 3.89 |
| 垂直 | 2 | 4.33 |
| 集める | 2 | 3.30 |
| 命じる | 2 | 3.40 |
| 生々しい | 2 | 4.40 |
| 聞きもしないで | 2 | 6.89 |
| 応接室 | 2 | 4.00 |
| 見あたる | 2 | 5.07 |
| 席を立つ | 2 | 4.37 |
| 総数 | 2 | 4.50 |
| 一目瞭然 | 2 | 4.27 |
| 綺羅 | 2 | 4.04 |
| 棘 | 2 | 3.98 |
| 多体 | 2 | 4.92 |
| 精神的苦痛 | 2 | 5.47 |
| どさくさに紛れて | 2 | 4.78 |
| 殴りつける | 2 | 4.09 |
| 否々 | 2 | 3.79 |
| 口喧嘩 | 2 | 4.75 |
| てね | 2 | 3.19 |
| 目をそらす | 2 | 4.77 |
| 仕組み | 2 | 3.79 |
| した方がいい | 2 | 4.03 |
| 大それた | 2 | 4.67 |
| 照明 | 2 | 4.16 |
| 平然 | 2 | 4.05 |
| 戴けない | 2 | 4.53 |
| 見知らぬ | 2 | 3.93 |
| 三つ子 | 2 | 4.74 |
| 混合 | 2 | 4.46 |
| ならぬ | 2 | 3.59 |
| 辺境 | 2 | 3.53 |
| 毛皮 | 2 | 3.69 |
| 我が家 | 2 | 3.70 |
| 翻し | 2 | 4.21 |
| 外套 | 2 | 3.81 |
| 両軍 | 2 | 4.46 |
| 講義 | 2 | 3.77 |
| お役目 | 2 | 4.66 |
| 落ちつく | 2 | 4.56 |
| 対する | 2 | 3.89 |
| 印象的 | 2 | 4.26 |
| さっさと | 2 | 3.12 |
| 角度 | 2 | 3.90 |
| 缶 | 2 | 4.43 |
| 小心 | 2 | 5.11 |
| 未だかつて | 2 | 5.03 |
| 散る | 2 | 3.52 |
| 世話になる | 2 | 4.74 |
| 前半 | 2 | 4.03 |
| 左胸 | 2 | 4.70 |
| 木登り | 2 | 4.78 |
| 顔を出す | 2 | 3.97 |
| 飛び跳ねる | 2 | 4.19 |
| チャンス | 2 | 3.55 |
| 鬱陶しい | 2 | 3.92 |
| 送り出す | 2 | 4.06 |
| 一周年 | 2 | 5.41 |
| 経て | 2 | 3.83 |
| 無しには | 2 | 5.07 |
| 大騒動 | 2 | 4.97 |
| 決まり | 2 | 3.89 |
| 隔て | 2 | 4.67 |
| 未だしも | 2 | 3.91 |
| 物質 | 2 | 3.82 |
| 手四 | 2 | 4.23 |
| 非常時 | 2 | 4.56 |
| 響きわたる | 2 | 4.60 |
| 雇い入れる | 2 | 5.40 |
| なんと言っても | 2 | 4.51 |
| しがみ付く | 2 | 4.39 |
| 殊勝 | 2 | 4.50 |
| にあっては | 2 | 4.79 |
| 大地 | 2 | 3.20 |
| 急ぐ | 2 | 3.42 |
| 即答 | 2 | 3.92 |
| 使い手 | 2 | 3.73 |
| 弱点 | 2 | 3.62 |
| に連れ | 2 | 3.76 |
| 打ち解ける | 2 | 4.33 |
| 働き者 | 2 | 4.77 |
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