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 |
|---|---|---|
| 全域 | 3 | 4.38 |
| 酒池肉林 | 3 | 5.41 |
| ロマン | 3 | 4.13 |
| 万全 | 3 | 3.85 |
| 新調 | 3 | 4.43 |
| 笑い声 | 3 | 3.54 |
| 定め | 3 | 3.97 |
| 注ぐ | 3 | 3.35 |
| 四本 | 3 | 4.21 |
| 翳り | 3 | 5.06 |
| 大声 | 3 | 3.45 |
| 派遣 | 3 | 3.51 |
| あいよ | 3 | 4.39 |
| 北東 | 3 | 4.24 |
| ボス | 3 | 3.34 |
| 摂る | 3 | 4.03 |
| 芳しい | 3 | 4.50 |
| 幹部 | 3 | 3.65 |
| 休まる | 3 | 4.66 |
| 複雑 | 3 | 3.34 |
| お手伝い | 3 | 3.83 |
| 一室 | 3 | 3.82 |
| 変形 | 3 | 3.93 |
| 寒さ | 3 | 3.89 |
| 手がかり | 3 | 4.18 |
| 上座 | 3 | 4.50 |
| 並走 | 3 | 4.59 |
| シワ | 3 | 4.50 |
| 鏡 | 3 | 3.47 |
| 独特 | 3 | 3.76 |
| 割れ | 3 | 3.80 |
| に従い | 3 | 3.80 |
| あいつら | 3 | 3.47 |
| ナビ | 3 | 4.69 |
| 内争 | 3 | 4.75 |
| 手上げ | 3 | 3.61 |
| 差し伸べる | 3 | 4.08 |
| 猛者 | 3 | 3.76 |
| 土俵 | 3 | 4.55 |
| 極める | 3 | 4.04 |
| 防寒着 | 3 | 5.15 |
| シャー | 3 | 3.88 |
| 気温 | 3 | 4.01 |
| ガタガタ | 3 | 4.31 |
| 高濃度 | 3 | 4.93 |
| 山々 | 3 | 4.26 |
| こら | 3 | 3.74 |
| 徴兵 | 3 | 4.59 |
| エスコート | 3 | 4.08 |
| 絡み合う | 3 | 4.34 |
| 日本海 | 3 | 5.44 |
| はずです | 3 | 3.45 |
| 神妙 | 3 | 4.02 |
| 目当て | 3 | 3.87 |
| 無きゃ | 3 | 3.95 |
| 迷惑をかける | 3 | 4.47 |
| 友人 | 3 | 3.09 |
| 閉める | 3 | 3.66 |
| 中旬 | 3 | 5.02 |
| 何度 | 3 | 3.72 |
| 簡素 | 3 | 4.07 |
| アジの開き | 3 | 6.07 |
| 逆 | 3 | 3.48 |
| 権利 | 3 | 3.65 |
| 人目 | 3 | 3.91 |
| 子女 | 3 | 4.47 |
| タフ | 3 | 4.40 |
| 幾つも | 3 | 3.39 |
| 歩き回る | 3 | 4.10 |
| 精いっぱい | 3 | 4.50 |
| 事件 | 3 | 3.20 |
| 捕獲 | 3 | 3.95 |
| 食後 | 3 | 4.13 |
| 麓 | 3 | 4.12 |
| ってな | 3 | 3.50 |
| 二九 | 3 | 4.05 |
| 包み込む | 3 | 3.70 |
| 細め | 3 | 3.57 |
| 中尉 | 3 | 4.40 |
| ソロ | 3 | 3.76 |
| がてら | 3 | 4.23 |
| 引け | 3 | 4.22 |
| 日増しに | 3 | 5.35 |
| 趣味 | 3 | 3.37 |
| 悪戦苦闘 | 3 | 4.93 |
| 一直線 | 3 | 3.87 |
| 見当もつかない | 3 | 4.71 |
| 邪魔にならない | 3 | 4.27 |
| 個目 | 3 | 4.09 |
| 間隔 | 3 | 4.13 |
| 顔を出す | 3 | 3.97 |
| 敬う | 3 | 4.34 |
| コレクション | 3 | 4.51 |
| 幾つ | 3 | 4.07 |
| 銃器 | 3 | 4.50 |
| 上部 | 3 | 4.17 |
| スクラップ | 3 | 5.10 |
| 循環 | 3 | 4.00 |
| 晶洞 | 3 | 5.78 |
| 抗う | 3 | 3.89 |
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