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 |
|---|---|---|
| 代々 | 1 | 4.04 |
| 衝突 | 1 | 3.76 |
| 共々 | 1 | 4.10 |
| 半殺し | 1 | 4.78 |
| 寝首 | 1 | 5.18 |
| 誰であれ | 1 | 5.15 |
| 配偶者 | 1 | 4.82 |
| 正当 | 1 | 4.16 |
| 刃向かう | 1 | 5.12 |
| 一兵卒 | 1 | 5.00 |
| 一揃え | 1 | 5.99 |
| 白熱 | 1 | 4.51 |
| 勲 | 1 | 2.66 |
| 訳がない | 1 | 4.11 |
| 振りかざす | 1 | 4.28 |
| 不服 | 1 | 4.23 |
| さぞ | 1 | 4.24 |
| 浅慮 | 1 | 4.95 |
| 下す | 1 | 3.54 |
| 黙りこくる | 1 | 4.80 |
| 組織 | 1 | 3.25 |
| 食ってかかる | 1 | 5.16 |
| 錯覚 | 1 | 3.81 |
| 死んだフリ | 1 | 5.80 |
| 席を譲る | 1 | 5.80 |
| あきれ顔 | 1 | 5.32 |
| 猫耳 | 1 | 3.94 |
| すれすれ | 1 | 4.68 |
| 幼き | 1 | 4.44 |
| 不思議なくらい | 1 | 4.86 |
| 隷属 | 1 | 4.00 |
| 末路 | 1 | 4.30 |
| 倒さ | 1 | 3.79 |
| 甚大 | 1 | 4.33 |
| 蟹 | 1 | 3.81 |
| 通常業務 | 1 | 5.05 |
| 乗り出す | 1 | 3.81 |
| シチュエーション | 1 | 4.31 |
| 案の定 | 1 | 3.83 |
| 空を飛ぶ | 1 | 3.96 |
| 建造 | 1 | 4.10 |
| 難い | 1 | 3.79 |
| どうしたもんか | 1 | 4.68 |
| 生まれてこの方 | 1 | 5.01 |
| 立ち向かう | 1 | 3.92 |
| 壊滅 | 1 | 3.76 |
| 心ゆくまで | 1 | 5.15 |
| 速 | 1 | 3.90 |
| きりっと | 1 | 4.39 |
| 思うところがある | 1 | 4.54 |
| 刳る | 1 | 4.72 |
| ぎくり | 1 | 5.74 |
| 約束通り | 1 | 4.40 |
| 潰れ | 1 | 4.06 |
| お土産 | 1 | 3.83 |
| 体格 | 1 | 3.64 |
| 水しぶき | 1 | 4.87 |
| 魔獣 | 1 | 2.97 |
| 雷火 | 1 | 5.34 |
| お世辞 | 1 | 4.48 |
| 取りだす | 1 | 4.52 |
| 部隊 | 1 | 2.88 |
| 放り出す | 1 | 3.88 |
| 何れにも | 1 | 5.27 |
| どうしたって | 1 | 4.43 |
| お構い | 1 | 4.87 |
| 偶然にも | 1 | 4.62 |
| 盗み見る | 1 | 4.72 |
| 南国 | 1 | 4.71 |
| 時差 | 1 | 4.64 |
| くれぐれも | 1 | 4.13 |
| 鍛え | 1 | 3.51 |
| かけ離れる | 1 | 4.28 |
| 任せっきり | 1 | 5.02 |
| おつまみ | 1 | 5.14 |
| 刺々 | 1 | 5.02 |
| 続々 | 1 | 4.22 |
| 命を奪う | 1 | 4.46 |
| 常識はずれ | 1 | 5.33 |
| 一軍 | 1 | 4.38 |
| 噴水 | 1 | 4.09 |
| 言いよう | 1 | 3.98 |
| 気立て | 1 | 5.23 |
| 仕組む | 1 | 4.43 |
| と言わず | 1 | 4.52 |
| 打ち出し | 1 | 5.03 |
| 発泡酒 | 1 | 5.62 |
| 賞辞 | 1 | 7.59 |
| 商店 | 1 | 4.05 |
| 名実ともに | 1 | 5.03 |
| 戦術 | 1 | 3.67 |
| 傷つきやすい | 1 | 5.86 |
| 送り | 1 | 3.90 |
| に付け | 1 | 3.88 |
| 女王 | 1 | 3.17 |
| 揉み揉み | 1 | 5.37 |
| 来訪者 | 1 | 4.40 |
| 玄関ホール | 1 | 4.67 |
| 走らせる | 1 | 4.16 |
| 髪結 | 1 | 6.14 |
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