★Novelized by Overlap Bunko. Series cumulative sales exceed 1 million copies. All 13 volumes now on sale. Once, the boy was called the "God of War." He saved a fallen nation in the otherworld called Alethia, and through conquering surrounding countries, he built a great empire. However, the boy made the resolve to abandon everything and returned to the modern era at the cost of losing his memory. Three years have passed, and the boy was living his days happily. But then he is summoned back to the otherworld once more. However, it was Alethia 1,000 years in the future. His past glory has become "myth," and the "legend" of the boy called the "Dual Black Hero King" begins to unfold.
| Word | Frequency | Difficulty |
|---|---|---|
| 時間をかける | 1 | 4.86 |
| 言い難い | 1 | 4.09 |
| 食う | 1 | 3.13 |
| 百 | 1 | 3.26 |
| 幸い | 1 | 3.30 |
| 勿体ない | 1 | 3.70 |
| 不毛の地 | 1 | 5.51 |
| とも言う | 1 | 4.32 |
| 留守 | 1 | 4.09 |
| 申し出る | 1 | 4.15 |
| 楽観的 | 1 | 4.45 |
| 不可視 | 1 | 4.17 |
| 討つ | 1 | 3.74 |
| 張り | 1 | 3.82 |
| やっと | 1 | 3.21 |
| 読み聞かせる | 1 | 5.80 |
| 我々 | 1 | 3.01 |
| 租借 | 1 | 5.70 |
| 連れ | 1 | 3.81 |
| 財 | 1 | 4.63 |
| 予測 | 1 | 3.60 |
| 常駐 | 1 | 4.39 |
| 刀伊 | 1 | 3.64 |
| だり | 1 | 3.41 |
| 必要ない | 1 | 3.67 |
| 大声 | 1 | 3.45 |
| 連れていく | 1 | 4.26 |
| 凶刃 | 1 | 4.89 |
| 多勢に無勢 | 1 | 4.80 |
| 時間の問題 | 1 | 4.12 |
| 素通り | 1 | 4.42 |
| 礼 | 1 | 3.28 |
| 宮 | 1 | 3.53 |
| 化 | 1 | 2.96 |
| 返礼 | 1 | 4.79 |
| そんなところ | 1 | 3.92 |
| 訳じゃない | 1 | 3.07 |
| 最大 | 1 | 3.23 |
| 寝そべる | 1 | 4.31 |
| ぼーっと | 1 | 4.28 |
| 屈める | 1 | 4.47 |
| 仄か | 1 | 4.02 |
| 絹 | 1 | 4.29 |
| からこそ | 1 | 3.25 |
| 猛攻 | 1 | 4.23 |
| 家老 | 1 | 4.85 |
| 長い間 | 1 | 4.02 |
| 若くして | 1 | 4.56 |
| 素人目 | 1 | 4.91 |
| 本能 | 1 | 3.70 |
| 経てば | 1 | 4.31 |
| 鈍い音 | 1 | 4.28 |
| 積み上げ | 1 | 4.08 |
| あれから | 1 | 3.70 |
| 静けさ | 1 | 4.37 |
| 高価 | 1 | 3.78 |
| 攻め寄せる | 1 | 4.70 |
| するべき | 1 | 3.77 |
| 短髪 | 1 | 4.55 |
| 夜更かし | 1 | 4.70 |
| 無理矢理 | 1 | 3.64 |
| 欲望 | 1 | 3.84 |
| ニコッと | 1 | 4.79 |
| ドスドス | 1 | 5.34 |
| 顔面 | 1 | 3.59 |
| なるだけ | 1 | 4.13 |
| 集まり | 1 | 3.63 |
| 鋼鉄 | 1 | 4.02 |
| 屠殺 | 1 | 5.25 |
| 陳情 | 1 | 4.77 |
| 手を合わせる | 1 | 4.96 |
| シャイ | 1 | 4.73 |
| 勇猛果敢 | 1 | 4.98 |
| 不都合 | 1 | 4.30 |
| 遠路はるばる | 1 | 5.17 |
| なのです | 1 | 2.91 |
| 併呑 | 1 | 4.99 |
| 何なりと | 1 | 4.68 |
| 吟味 | 1 | 4.30 |
| 徹底 | 1 | 4.04 |
| 禍々しい | 1 | 4.01 |
| 殺し合う | 1 | 4.79 |
| 気持ち悪い | 1 | 3.75 |
| 見かねる | 1 | 4.32 |
| 眠い | 1 | 3.83 |
| 間際 | 1 | 4.31 |
| うるせぇ | 1 | 4.57 |
| 敵味方 | 1 | 4.42 |
| 協定 | 1 | 4.57 |
| 参加 | 1 | 2.93 |
| 容姿端麗 | 1 | 5.10 |
| 汚染 | 1 | 4.24 |
| 年長者 | 1 | 4.51 |
| 騒がしい | 1 | 3.67 |
| 派 | 1 | 3.22 |
| 形成 | 1 | 3.72 |
| 整える | 1 | 3.55 |
| 広く | 1 | 3.60 |
| 一難去ってまた一難 | 1 | 5.65 |
| 狩り | 1 | 3.18 |
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