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 |
|---|---|---|
| 埋め合わせ | 1 | 4.88 |
| 虹色 | 1 | 4.18 |
| 時を同じくして | 1 | 4.97 |
| 幼馴染 | 1 | 3.65 |
| 蚊 | 1 | 4.57 |
| 辛く | 1 | 4.04 |
| 泉 | 1 | 3.74 |
| ラインナップ | 1 | 4.88 |
| ご無沙汰 | 1 | 4.40 |
| 無理しないで | 1 | 4.88 |
| くどい | 1 | 4.76 |
| う歯 | 1 | 4.60 |
| 最大規模 | 1 | 4.99 |
| 媚び | 1 | 4.75 |
| ジャンジャン | 1 | 5.66 |
| 飛びきり | 1 | 5.97 |
| くるっと | 1 | 4.90 |
| 迷い込む | 1 | 4.30 |
| ぐつぐつ | 1 | 5.13 |
| 敗 | 1 | 4.89 |
| お代 | 1 | 4.74 |
| 別格 | 1 | 4.47 |
| 理想的 | 1 | 4.31 |
| 完ぺき | 1 | 5.56 |
| さすれば | 1 | 4.67 |
| 浮つく | 1 | 4.70 |
| 修学旅行 | 1 | 4.46 |
| あり様 | 1 | 4.83 |
| ツキノワグマ | 1 | 5.95 |
| 伸びをする | 1 | 4.75 |
| 竹の皮 | 1 | 6.19 |
| まごう事なき | 1 | 5.10 |
| 朝焼け | 1 | 4.80 |
| そびえ立つ | 1 | 4.58 |
| 引継ぎ | 1 | 4.79 |
| 雲行き | 1 | 5.01 |
| 染入る | 1 | 7.29 |
| 痛み入る | 1 | 4.85 |
| 巻く | 1 | 3.53 |
| ガン | 1 | 3.90 |
| 好意 | 1 | 3.72 |
| 毎夜 | 1 | 4.52 |
| 通り道 | 1 | 4.66 |
| お体 | 1 | 4.76 |
| 弟子入り | 1 | 4.50 |
| くたばれ | 1 | 4.95 |
| 何にしても | 1 | 4.44 |
| 風邪をひく | 1 | 5.42 |
| 家事 | 1 | 4.03 |
| 気さく | 1 | 4.30 |
| 肺 | 1 | 4.14 |
| 何れにしても | 1 | 4.36 |
| 干渉 | 1 | 3.54 |
| 祝賀 | 1 | 5.06 |
| オールバック | 1 | 4.72 |
| お休みなさい | 1 | 4.33 |
| グリーン | 1 | 4.29 |
| ひとっ風呂 | 1 | 5.66 |
| ハテナマーク | 1 | 5.44 |
| 主人公 | 1 | 3.33 |
| 好き好んで | 1 | 4.60 |
| 訝しむ | 1 | 4.62 |
| 枯葉 | 1 | 5.07 |
| 桁 | 1 | 4.16 |
| 受け答え | 1 | 4.39 |
| 重ね合わせ | 1 | 5.06 |
| 延び | 1 | 4.67 |
| 座右 | 1 | 6.75 |
| こすれ合う | 1 | 5.78 |
| 水もしたたる | 1 | 6.61 |
| 策 | 1 | 3.50 |
| 何年ぶりか | 1 | 5.69 |
| 不恰好 | 1 | 5.05 |
| 挫ける | 1 | 4.73 |
| ピンキリ | 1 | 5.26 |
| 参集 | 1 | 5.38 |
| 染める | 1 | 3.96 |
| 収容 | 1 | 4.35 |
| 泊り | 1 | 4.79 |
| 四割 | 1 | 4.87 |
| 日ごろ | 1 | 4.98 |
| 蔦 | 1 | 3.96 |
| 前に進む | 1 | 4.47 |
| クソッ | 1 | 4.20 |
| 寝息 | 1 | 4.06 |
| ほっほっほっ | 1 | 5.24 |
| 出頭 | 1 | 4.94 |
| 手槍 | 1 | 3.91 |
| 何人も | 1 | 3.85 |
| ファン | 1 | 3.72 |
| 健全 | 1 | 4.31 |
| 空っぽ | 1 | 4.20 |
| セット | 1 | 3.54 |
| 宝の山 | 1 | 4.98 |
| 断罪 | 1 | 4.08 |
| 分岐点 | 1 | 4.78 |
| 集い | 1 | 4.55 |
| かつてない | 1 | 4.53 |
| 髪型 | 1 | 4.06 |
| 呼び | 1 | 3.57 |
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