In a future Japan divided into several small nations after the collapse of civilization, this is a rise-to-power harem story depicting battles and adventures woven between the protagonist who has obtained the strongest level of power and several girls. The protagonist, who has time-slipped into a post-civilization-collapse future where special powers have become commonplace, takes up work as an "excavator," uncovering modern machine parts, products, metals and other items said to be relics from the mythological age based on memories and knowledge from that era. Furthermore, the protagonist encounters a beautiful girl in that land. This girl is the grown-up version of the neighbor's only daughter who was caught up in the time transfer before it happened—a young girl who adored him saying "I love you, big brother." That neighbor has become a Grand Duke ruling that land. ※Book version Volume 1 released on December 25, 2015. Book version Volume 2 released on February 25, 2016. Book version Volume 3 released on November 10, 2016.
| Word | Frequency | Difficulty |
|---|---|---|
| 羞恥 | 1 | 4.20 |
| 今古 | 1 | 5.97 |
| 名に恥じない | 1 | 5.16 |
| 八方塞がり | 1 | 5.26 |
| 一山当てる | 1 | 6.69 |
| 余力 | 1 | 4.29 |
| 言ってのける | 1 | 4.81 |
| 念う | 1 | 4.59 |
| 物言い | 1 | 3.78 |
| 燃え盛る | 1 | 4.16 |
| 左様 | 1 | 4.27 |
| 牛 | 1 | 3.67 |
| 睦まじい | 1 | 4.67 |
| ダシ | 1 | 4.79 |
| コク | 1 | 4.81 |
| 兄ちゃん | 1 | 3.55 |
| ショック | 1 | 3.60 |
| 時速 | 1 | 4.16 |
| 豊満 | 1 | 4.45 |
| 一軒家 | 1 | 4.65 |
| 攻防 | 1 | 3.93 |
| 狙い通り | 1 | 4.49 |
| 神経をすり減らす | 1 | 5.71 |
| へぇ | 1 | 3.58 |
| 落ちぶれる | 1 | 4.72 |
| 設計 | 1 | 3.97 |
| 駆り出す | 1 | 4.42 |
| 低学年 | 1 | 4.99 |
| 遠ざかる | 1 | 3.90 |
| 突っ伏す | 1 | 4.13 |
| 自粛 | 1 | 5.02 |
| 掃討 | 1 | 4.27 |
| シソ | 1 | 5.73 |
| なぞ | 1 | 4.17 |
| 軌道に乗る | 1 | 5.59 |
| 一人称 | 1 | 4.54 |
| シャキシャキ | 1 | 5.19 |
| 苦 | 1 | 4.20 |
| 気にするな | 1 | 3.91 |
| ずる賢い | 1 | 5.55 |
| 通知 | 1 | 4.53 |
| デート | 1 | 3.62 |
| 生まれたて | 1 | 4.79 |
| 露出狂 | 1 | 5.18 |
| 教育ママ | 1 | 5.95 |
| じゃねえ | 1 | 3.34 |
| 男子学生 | 1 | 5.06 |
| 匂う | 1 | 4.92 |
| 早足 | 1 | 4.34 |
| 止まない | 1 | 4.63 |
| 講じる | 1 | 4.46 |
| 落石 | 1 | 5.04 |
| 殺戮 | 1 | 3.92 |
| 冷気 | 1 | 4.02 |
| 居座る | 1 | 4.30 |
| 余念がない | 1 | 5.07 |
| 結納 | 1 | 5.32 |
| か国 | 1 | 5.08 |
| 救世 | 1 | 4.30 |
| 思いをする | 1 | 4.62 |
| 荒業 | 1 | 5.05 |
| 同時 | 1 | 3.64 |
| 野生 | 1 | 3.95 |
| 乗り切る | 1 | 4.30 |
| 挫ける | 1 | 4.73 |
| 第一声 | 1 | 4.55 |
| 軍事力 | 1 | 4.30 |
| 劣勢 | 1 | 4.26 |
| ぼんやり | 1 | 3.52 |
| つかぬ事 | 1 | 5.21 |
| 奉る | 1 | 4.46 |
| 粧う | 1 | 5.68 |
| 突っ切る | 1 | 4.33 |
| 深淵 | 1 | 4.11 |
| 寒風 | 1 | 5.17 |
| 過大評価 | 1 | 4.83 |
| 長物 | 1 | 4.99 |
| お坊ちゃま | 1 | 5.05 |
| 人的 | 1 | 4.67 |
| 宴会場 | 1 | 4.94 |
| 経験が浅い | 1 | 5.48 |
| 目が離せない | 1 | 4.92 |
| 専門店 | 1 | 4.75 |
| 電線 | 1 | 5.36 |
| 噛りつく | 1 | 6.81 |
| 稲穂 | 1 | 4.62 |
| 鬼に金棒 | 1 | 5.56 |
| 長引かせる | 1 | 5.19 |
| ドブネズミ | 1 | 5.49 |
| お断り | 1 | 3.92 |
| 埼玉 | 1 | 5.22 |
| どうしたものか | 1 | 4.04 |
| 飛び退る | 1 | 5.19 |
| 山桜桃 | 1 | 5.79 |
| 数量 | 1 | 5.05 |
| 心ここにあらず | 1 | 5.09 |
| 軋む | 1 | 4.05 |
| 露骨 | 1 | 3.94 |
| ウホウホ | 1 | 6.31 |
| おいそれと | 1 | 4.50 |
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