★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 |
|---|---|---|
| 合流 | 13 | 3.35 |
| 闇 | 13 | 2.79 |
| 座る | 13 | 2.78 |
| 隙間 | 13 | 3.44 |
| 捉える | 13 | 3.34 |
| ゴブリン | 13 | 2.93 |
| 恐怖 | 13 | 3.06 |
| 握りしめる | 13 | 3.65 |
| 眼前 | 13 | 3.58 |
| 国境 | 13 | 3.58 |
| 許す | 13 | 2.89 |
| 見上げる | 13 | 3.03 |
| 騎士団 | 13 | 2.86 |
| 怖い | 13 | 2.81 |
| 皇 | 13 | 3.24 |
| 周り | 13 | 2.77 |
| 思い | 13 | 2.61 |
| 地 | 13 | 2.92 |
| 流石に | 13 | 2.63 |
| 敵軍 | 13 | 4.00 |
| 廟 | 13 | 5.00 |
| でしょ | 13 | 3.03 |
| それで | 13 | 2.44 |
| 村 | 13 | 2.56 |
| 頭上 | 13 | 3.41 |
| 下ろす | 13 | 3.29 |
| 指示 | 13 | 2.98 |
| 何で | 13 | 2.52 |
| 思い出す | 13 | 2.70 |
| 何度も | 13 | 2.93 |
| 小さな | 13 | 2.71 |
| 現在 | 12 | 2.87 |
| かしら | 12 | 2.79 |
| 石 | 12 | 2.85 |
| 率いる | 12 | 3.25 |
| 反応 | 12 | 2.69 |
| なのだ | 12 | 2.41 |
| 朝食 | 12 | 3.36 |
| 残る | 12 | 2.71 |
| 副官 | 12 | 3.86 |
| 端 | 12 | 3.22 |
| 小さい | 12 | 2.69 |
| 丸で | 12 | 2.60 |
| 一瞬 | 12 | 2.69 |
| そこ | 12 | 2.66 |
| 宛 | 12 | 3.72 |
| 変わる | 12 | 2.75 |
| 旗 | 12 | 3.80 |
| 涙 | 12 | 2.98 |
| 着 | 12 | 2.95 |
| でもある | 12 | 2.97 |
| 鳴らす | 12 | 3.32 |
| 多く | 12 | 2.66 |
| 欲しい | 12 | 2.46 |
| 本陣 | 12 | 3.99 |
| 終わる | 12 | 2.44 |
| 慌てる | 12 | 2.84 |
| される | 12 | 2.48 |
| 肌 | 12 | 3.16 |
| 切り裂く | 12 | 3.43 |
| 染まる | 12 | 3.39 |
| 受ける | 12 | 2.66 |
| 迫る | 12 | 3.06 |
| 動き | 12 | 2.57 |
| 囲む | 12 | 3.17 |
| でしょう | 12 | 2.49 |
| 重い | 12 | 3.10 |
| 耐える | 12 | 3.10 |
| 一緒に | 12 | 2.46 |
| 笑う | 12 | 2.45 |
| 膝 | 12 | 3.14 |
| 波動 | 12 | 2.63 |
| 七日 | 12 | 2.50 |
| モンスター | 12 | 2.62 |
| 目の前 | 12 | 2.63 |
| 影 | 12 | 2.89 |
| 与える | 12 | 3.03 |
| 今回 | 12 | 2.47 |
| 作戦 | 12 | 3.04 |
| 処 | 12 | 2.38 |
| その儘 | 12 | 2.51 |
| だからと言って | 11 | 3.47 |
| 落とし | 11 | 3.24 |
| 考える | 11 | 2.30 |
| 唐名 | 11 | 2.55 |
| 派手 | 11 | 3.46 |
| 閉じる | 11 | 3.13 |
| 戦争 | 11 | 3.00 |
| 馬車 | 11 | 2.74 |
| 何の | 11 | 2.78 |
| 主 | 11 | 2.62 |
| 前線 | 11 | 3.66 |
| 黙る | 11 | 2.92 |
| 断崖 | 11 | 4.74 |
| 陣 | 11 | 3.20 |
| お前 | 11 | 2.16 |
| 形 | 11 | 2.70 |
| みたいな | 11 | 2.70 |
| 掲げる | 11 | 3.37 |
| さん | 11 | 1.77 |
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