★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 |
|---|---|---|
| 注意 | 3 | 3.10 |
| 常人 | 3 | 3.98 |
| どうやって | 3 | 3.23 |
| お互い | 3 | 3.30 |
| 故に | 3 | 3.04 |
| 派遣 | 3 | 3.51 |
| 幾多 | 3 | 4.54 |
| 暑い | 3 | 3.77 |
| 年下 | 3 | 3.87 |
| 恐ろしい | 3 | 3.13 |
| 招く | 3 | 3.49 |
| 後遺症 | 3 | 4.47 |
| 押し | 3 | 3.46 |
| 吠える | 3 | 3.84 |
| なれば | 3 | 2.99 |
| 死者 | 3 | 3.65 |
| 中心 | 3 | 3.08 |
| 救う | 3 | 3.16 |
| 比べる | 3 | 3.21 |
| 総大将 | 3 | 4.29 |
| 無ければ | 3 | 3.11 |
| ど | 3 | 3.26 |
| 平和 | 3 | 3.39 |
| 線 | 3 | 3.53 |
| と言えども | 3 | 4.07 |
| 出居 | 3 | 3.37 |
| 迷い | 3 | 3.59 |
| バルコニー | 3 | 4.25 |
| てな | 3 | 3.27 |
| 一撃 | 3 | 2.89 |
| 高校生 | 3 | 3.97 |
| やら | 3 | 2.96 |
| 減らす | 3 | 3.57 |
| 予想外 | 3 | 3.46 |
| こう | 3 | 2.92 |
| 選ぶ | 3 | 2.84 |
| であれば | 3 | 2.92 |
| この先 | 3 | 3.52 |
| 半分 | 3 | 3.03 |
| 画僧 | 3 | 2.89 |
| 心の中 | 3 | 3.40 |
| 調子 | 3 | 3.23 |
| 証明 | 3 | 3.41 |
| について | 3 | 2.42 |
| 揃え | 3 | 3.64 |
| 把握 | 3 | 3.17 |
| 祀る | 3 | 4.40 |
| 即 | 3 | 3.94 |
| 出立 | 3 | 4.09 |
| 真っ先に | 3 | 3.65 |
| 微笑み | 3 | 3.30 |
| としたら | 3 | 3.18 |
| 夜空 | 3 | 3.94 |
| 奪い取る | 3 | 4.10 |
| あり得ない | 3 | 3.35 |
| 充実 | 3 | 3.94 |
| 単語 | 3 | 3.67 |
| 脱炭 | 3 | 3.01 |
| 持ち上げる | 3 | 3.40 |
| 並んで | 3 | 3.28 |
| こうして | 3 | 2.83 |
| 軍隊 | 3 | 3.83 |
| 趣味 | 3 | 3.37 |
| 天地人 | 3 | 6.53 |
| 将来 | 3 | 3.44 |
| 地域 | 3 | 3.52 |
| 住む | 3 | 3.05 |
| 国民 | 3 | 3.58 |
| 第一陣 | 3 | 4.71 |
| 諦める | 3 | 3.20 |
| 身分 | 3 | 3.36 |
| 基調 | 3 | 4.28 |
| 白地 | 3 | 4.92 |
| 岩陰 | 3 | 4.63 |
| 効果 | 3 | 2.77 |
| 望み | 3 | 3.62 |
| 首が飛ぶ | 3 | 5.05 |
| 回し | 3 | 3.38 |
| 吹き荒れる | 3 | 4.18 |
| 刺激 | 3 | 3.60 |
| 先端 | 3 | 3.65 |
| 痛む | 3 | 3.75 |
| 振り切る | 3 | 4.01 |
| 当初 | 3 | 3.47 |
| 射手 | 3 | 3.08 |
| 分けて | 3 | 3.68 |
| 興奮 | 3 | 3.38 |
| 二本 | 3 | 3.56 |
| そっか | 3 | 3.38 |
| 先日 | 3 | 3.39 |
| 長年 | 3 | 3.70 |
| もう一度 | 3 | 3.13 |
| 携える | 3 | 4.02 |
| 飲む | 3 | 2.84 |
| 目にもとまらぬ | 3 | 5.43 |
| 恥ずかしい | 3 | 3.05 |
| 機動力 | 3 | 4.06 |
| 混沌 | 3 | 3.91 |
| 討伐 | 3 | 2.99 |
| 元気 | 3 | 3.07 |
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