★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 |
|---|---|---|
| 屠る | 6 | 4.01 |
| 敵陣 | 6 | 4.12 |
| 速度 | 6 | 2.90 |
| 皇位継承者 | 6 | 5.45 |
| 汗 | 6 | 3.33 |
| 水 | 6 | 2.51 |
| 右腕 | 6 | 3.47 |
| 怯む | 6 | 3.84 |
| 歪む | 6 | 3.51 |
| 開始 | 6 | 3.07 |
| 本隊 | 6 | 3.97 |
| とりあえず | 6 | 2.73 |
| はは | 6 | 3.43 |
| 笑い | 6 | 2.95 |
| 歴史 | 6 | 3.34 |
| 向く | 6 | 3.30 |
| 乱れ | 6 | 3.89 |
| 彩る | 6 | 4.04 |
| これ以上 | 6 | 3.04 |
| 全身 | 7 | 2.97 |
| 嘘 | 7 | 2.93 |
| 制服 | 7 | 3.59 |
| 余計 | 7 | 3.16 |
| 潰す | 7 | 3.09 |
| 本の | 7 | 3.66 |
| 族 | 7 | 2.64 |
| 目的 | 7 | 2.83 |
| 求める | 7 | 3.21 |
| 見つめる | 7 | 2.75 |
| 異常 | 7 | 3.12 |
| 折れ | 7 | 3.68 |
| 塔 | 7 | 3.22 |
| 悟る | 7 | 3.47 |
| 袖 | 7 | 3.69 |
| 覚悟 | 7 | 3.02 |
| なよ | 7 | 3.13 |
| 名乗る | 7 | 3.29 |
| みたい | 7 | 2.65 |
| どうか | 7 | 3.04 |
| 残念 | 7 | 3.09 |
| 記す | 7 | 3.70 |
| 捕まえる | 7 | 3.41 |
| 殺し | 7 | 2.99 |
| 生き | 7 | 2.80 |
| 隙 | 7 | 3.12 |
| 尻尾 | 7 | 3.15 |
| 避け | 7 | 3.12 |
| 無事 | 7 | 3.09 |
| 時代 | 7 | 3.09 |
| 初めて | 7 | 2.64 |
| これで | 7 | 2.58 |
| 避ける | 7 | 3.08 |
| 気配 | 7 | 2.79 |
| 大きい | 7 | 2.90 |
| 怒る | 7 | 2.88 |
| はい | 7 | 2.31 |
| 出てくる | 7 | 3.14 |
| 信じる | 7 | 2.80 |
| 慣れる | 7 | 3.12 |
| アルト | 7 | 3.48 |
| 出し | 7 | 2.32 |
| 呼吸 | 7 | 3.43 |
| 突破 | 7 | 3.37 |
| 思わず | 7 | 2.73 |
| もので | 7 | 2.67 |
| 以上 | 7 | 2.42 |
| ても良い | 7 | 2.90 |
| 宿る | 7 | 3.56 |
| 見届ける | 7 | 3.75 |
| 変える | 7 | 3.02 |
| 助ける | 7 | 3.17 |
| 退く | 7 | 3.67 |
| 走る | 7 | 2.77 |
| 先ほど | 7 | 2.88 |
| 上半身 | 7 | 3.71 |
| 森 | 7 | 2.48 |
| 噴き出す | 7 | 3.85 |
| 其れと | 7 | 2.92 |
| 使者 | 7 | 3.59 |
| 家族 | 7 | 2.92 |
| 帝都 | 7 | 3.46 |
| やろう | 7 | 3.16 |
| 触れる | 7 | 3.08 |
| 意味 | 7 | 2.49 |
| 止める | 7 | 2.80 |
| 返事 | 7 | 2.98 |
| 地上 | 7 | 3.10 |
| 不利 | 7 | 3.45 |
| 雰囲気 | 7 | 2.89 |
| 終える | 7 | 2.86 |
| 被害 | 7 | 3.14 |
| あっさり | 7 | 3.15 |
| 阻む | 7 | 3.76 |
| 通過 | 7 | 3.83 |
| 入り口 | 7 | 3.28 |
| とは言え | 7 | 2.60 |
| 人物 | 7 | 2.80 |
| どれだけ | 7 | 3.08 |
| と言って | 7 | 2.71 |
| そもそも | 7 | 2.73 |
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