★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 |
|---|---|---|
| 強者 | 3 | 3.73 |
| 視点 | 3 | 3.59 |
| 故に | 3 | 3.04 |
| 襲いかかる | 3 | 3.59 |
| 立ち上がり | 3 | 3.46 |
| 乃公 | 3 | 3.15 |
| ほら | 3 | 3.02 |
| 木々 | 3 | 3.48 |
| その上 | 3 | 3.43 |
| 総出 | 3 | 2.91 |
| 地図 | 3 | 3.31 |
| らしき | 3 | 3.34 |
| 虐待 | 3 | 4.50 |
| 切り | 3 | 3.60 |
| 流し | 3 | 3.30 |
| 何とも | 3 | 3.28 |
| 見送り | 3 | 3.75 |
| 告げる | 3 | 2.80 |
| 軍隊 | 3 | 3.83 |
| 打ち破る | 3 | 4.15 |
| 愉悦 | 3 | 4.50 |
| 控え | 3 | 3.44 |
| 回転 | 3 | 3.46 |
| 幾つか | 3 | 3.13 |
| 規模 | 3 | 3.33 |
| 身分 | 3 | 3.36 |
| 選ぶ | 3 | 2.84 |
| 懐かしい | 3 | 3.51 |
| 染め上げる | 3 | 4.28 |
| 一撃 | 3 | 2.89 |
| 高校生 | 3 | 3.97 |
| 将来 | 3 | 3.44 |
| 昇る | 3 | 3.81 |
| 小競り合い | 3 | 4.37 |
| 並んで | 3 | 3.28 |
| それはそれで | 3 | 3.69 |
| 直に | 3 | 4.02 |
| 注意 | 3 | 3.10 |
| 後ずさる | 3 | 4.13 |
| 内部 | 3 | 3.28 |
| 住む | 3 | 3.05 |
| 調子 | 3 | 3.23 |
| 餌食 | 3 | 4.39 |
| 逸らす | 3 | 3.35 |
| 今日は | 3 | 2.66 |
| 幾多 | 3 | 4.54 |
| 単純 | 3 | 3.19 |
| 地域 | 3 | 3.52 |
| 飛びつく | 3 | 4.01 |
| かき消す | 3 | 4.23 |
| 携える | 3 | 4.02 |
| 目にもとまらぬ | 3 | 5.43 |
| 水たまり | 3 | 4.72 |
| 満たす | 3 | 3.44 |
| 踊る | 3 | 3.51 |
| 本来なら | 3 | 3.43 |
| 出居 | 3 | 3.37 |
| 始まり | 3 | 3.52 |
| 迷い | 3 | 3.59 |
| でよ | 3 | 3.78 |
| くくっ | 3 | 4.21 |
| ところを | 3 | 3.26 |
| 死者 | 3 | 3.65 |
| 花 | 3 | 2.84 |
| 射貫く | 3 | 4.90 |
| 打つ | 3 | 3.38 |
| 預かる | 3 | 3.59 |
| 他聞 | 3 | 3.15 |
| そろそろ | 3 | 2.88 |
| 苦労 | 3 | 3.22 |
| について | 3 | 2.42 |
| 影響 | 3 | 3.05 |
| 気品 | 3 | 4.39 |
| 作り | 3 | 3.14 |
| 嘲笑 | 3 | 4.09 |
| 受け取る | 3 | 3.03 |
| 脱炭 | 3 | 3.01 |
| 追い詰める | 3 | 3.64 |
| 冷静 | 3 | 3.16 |
| 処刑 | 3 | 3.74 |
| 泣き叫ぶ | 3 | 4.27 |
| 濡れる | 3 | 3.84 |
| 最前線 | 3 | 3.94 |
| 基調 | 3 | 4.28 |
| 魅力的 | 3 | 3.80 |
| 白地 | 3 | 4.92 |
| 征服 | 3 | 4.46 |
| 膨らむ | 3 | 3.63 |
| 単語 | 3 | 3.67 |
| 身体能力 | 3 | 3.57 |
| 今まで | 3 | 2.69 |
| 楽しむ | 3 | 3.09 |
| 射手 | 3 | 3.08 |
| 古い | 3 | 3.58 |
| 放る | 3 | 3.59 |
| 唯でさえ | 3 | 3.72 |
| かと思うと | 3 | 3.80 |
| 大勢 | 3 | 3.52 |
| 痛々しい | 3 | 4.24 |
| 混沌 | 3 | 3.91 |
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