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 |
|---|---|---|
| 女狐 | 1 | 4.75 |
| 担ぐ | 1 | 4.10 |
| 何もかも | 1 | 3.55 |
| 正しい | 1 | 3.12 |
| 停滞 | 1 | 3.92 |
| ツテ | 1 | 4.69 |
| 若造 | 1 | 4.36 |
| 命を奪う | 1 | 4.46 |
| 怒り狂う | 1 | 4.26 |
| 庭園 | 1 | 3.79 |
| 追い出す | 1 | 3.77 |
| やんちゃ | 1 | 4.57 |
| 頂戴 | 1 | 3.89 |
| 酌み交わす | 1 | 4.79 |
| 図書館 | 1 | 3.57 |
| せっつく | 1 | 4.86 |
| 口を利く | 1 | 5.05 |
| 足を運ぶ | 1 | 4.44 |
| 格段 | 1 | 4.07 |
| 久しい | 1 | 4.27 |
| ってね | 1 | 4.21 |
| 動植物 | 1 | 4.84 |
| ノーマル | 1 | 4.47 |
| 軍旗 | 1 | 4.90 |
| 鷲掴み | 1 | 4.36 |
| スーツ | 1 | 3.95 |
| 捜す | 1 | 3.93 |
| 付帯 | 1 | 5.67 |
| 史上 | 1 | 4.68 |
| 恋敵 | 1 | 4.72 |
| 吸い取る | 1 | 4.33 |
| 沸騰 | 1 | 4.28 |
| de | 1 | 3.93 |
| 重責 | 1 | 4.76 |
| 空を飛ぶ | 1 | 3.96 |
| 約束どおり | 1 | 5.14 |
| 界 | 1 | 3.71 |
| 欠損 | 1 | 4.32 |
| マシンガントーク | 1 | 5.33 |
| 世情 | 1 | 5.24 |
| 振るう | 1 | 3.18 |
| お昼 | 1 | 3.71 |
| 残念ながら | 1 | 3.45 |
| 苦しむ | 1 | 3.67 |
| 砂利 | 1 | 4.60 |
| 楽しげ | 1 | 3.83 |
| に際して | 1 | 4.49 |
| 多分 | 1 | 2.94 |
| 両者 | 1 | 3.67 |
| 訳がない | 1 | 4.11 |
| 整う | 1 | 3.66 |
| あなた達 | 1 | 3.65 |
| 消し去る | 1 | 4.56 |
| 昇りつめる | 1 | 6.94 |
| 眠りこむ | 1 | 5.92 |
| 良し | 1 | 3.85 |
| 首をかしげる | 1 | 4.19 |
| 経験者 | 1 | 4.49 |
| 大商人 | 1 | 4.43 |
| もう一回 | 1 | 4.10 |
| 咄嗟 | 1 | 4.33 |
| 恩人 | 1 | 4.10 |
| 素地 | 1 | 5.57 |
| 修復 | 1 | 3.54 |
| 参加資格 | 1 | 5.33 |
| 談 | 1 | 4.79 |
| 朝晩 | 1 | 5.15 |
| 小生意気 | 1 | 5.16 |
| ぽい | 1 | 4.24 |
| 蟹 | 1 | 3.81 |
| 何なりと | 1 | 4.68 |
| カモフラージュ | 1 | 4.72 |
| 役所 | 1 | 4.31 |
| ワンピース | 1 | 3.96 |
| わいわい | 1 | 4.67 |
| つき物 | 1 | 4.90 |
| ヒール | 1 | 3.84 |
| 1 | 1 | 2.85 |
| 六十 | 1 | 4.04 |
| 示唆 | 1 | 4.01 |
| 絶景 | 1 | 4.76 |
| はみ出す | 1 | 5.10 |
| 満足げ | 1 | 4.01 |
| 避けては通れない | 1 | 5.24 |
| 公開 | 1 | 3.94 |
| 姉妹 | 1 | 3.57 |
| 幾分 | 1 | 4.07 |
| 星 | 1 | 3.09 |
| 初戦 | 1 | 4.27 |
| 鍛錬 | 1 | 3.65 |
| に当たり | 1 | 4.02 |
| 毛足 | 1 | 5.22 |
| もぐ | 1 | 4.36 |
| 猛禽 | 1 | 4.86 |
| パワーバランス | 1 | 4.96 |
| 黙りこくる | 1 | 4.80 |
| 中てる | 1 | 4.84 |
| 疼く | 1 | 4.52 |
| 気立て | 1 | 5.23 |
| 頑張れ | 1 | 3.70 |
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