When Sahashi Kei awoke, he found himself in an unfamiliar land—another world. Waking up embedded in the ground, Kei realizes that he must have fallen from the sky. The one who discovered him falling was a sister named Emily. After Kei saves her from goblins, he realizes that he possesses tremendous power. In fact, Kei was a cyborg developed as a pilot for a lunar exploration rocket. However, his body in this other world was now capable of outputting tens of times more power than before. This was because a Philosopher's Stone had been embedded in his body's core—his heart. As Kei continues to defeat magical beasts, he becomes involved in various incidents as an adventurer, including battles with giant magical beasts and conspiracies among the nobility.
| Word | Frequency | Difficulty |
|---|---|---|
| 消火 | 3 | 4.70 |
| 険しい | 3 | 3.94 |
| 肩を落とす | 3 | 4.28 |
| 途端 | 3 | 3.59 |
| 胸当て | 3 | 4.41 |
| 本店 | 3 | 4.78 |
| やって見る | 3 | 4.07 |
| 上官 | 3 | 4.16 |
| 木々 | 3 | 3.48 |
| 武術 | 3 | 3.85 |
| お通り | 3 | 5.21 |
| 重んじる | 3 | 4.36 |
| 認識票 | 3 | 5.65 |
| 映す | 3 | 3.98 |
| 二本 | 3 | 3.56 |
| 作り直す | 3 | 4.47 |
| 普段着 | 3 | 4.45 |
| 何百 | 3 | 3.96 |
| 北の方 | 3 | 4.81 |
| CPU | 3 | 5.94 |
| 実用 | 3 | 4.62 |
| 駆け引き | 3 | 4.29 |
| 通用 | 3 | 3.67 |
| くるん | 3 | 4.01 |
| 賄賂 | 3 | 4.43 |
| だもの | 3 | 3.76 |
| 生まれ | 3 | 3.27 |
| 作物 | 3 | 4.02 |
| 拭き | 3 | 4.24 |
| 儕 | 3 | 4.34 |
| 身の安全 | 3 | 4.39 |
| 自己 | 3 | 3.25 |
| 発意 | 3 | 3.84 |
| 大きすぎる | 3 | 4.25 |
| 返却 | 3 | 4.44 |
| 脱臼 | 3 | 5.24 |
| 全員無事 | 3 | 4.85 |
| 表す | 3 | 3.61 |
| 搦み | 3 | 4.38 |
| 声を出す | 3 | 4.01 |
| ジャンケン | 3 | 4.90 |
| 碁盤の目 | 3 | 5.80 |
| 一生 | 3 | 3.60 |
| 騎士道 | 3 | 4.76 |
| 高揚 | 3 | 4.22 |
| ダウン | 3 | 4.32 |
| 願う | 3 | 3.27 |
| 尽きない | 3 | 4.53 |
| 僅かながら | 3 | 4.45 |
| 千年 | 3 | 3.80 |
| お古 | 3 | 5.21 |
| 俺たち | 3 | 2.60 |
| ソニックブーム | 3 | 5.51 |
| 力いっぱい | 3 | 4.61 |
| 背筋 | 3 | 3.62 |
| 審査 | 3 | 4.28 |
| 恐れがある | 3 | 4.40 |
| 一般市民 | 3 | 4.42 |
| 向かい合う | 3 | 3.83 |
| 組み | 3 | 3.74 |
| 排熱 | 3 | 5.76 |
| 途端に | 3 | 3.56 |
| 朱色 | 3 | 4.56 |
| 親分 | 3 | 4.18 |
| 神殿 | 3 | 2.99 |
| タマゴサンド | 3 | 5.83 |
| 敷地内 | 3 | 4.18 |
| 試練 | 3 | 3.52 |
| 模様 | 3 | 3.63 |
| 王様 | 3 | 3.37 |
| 照れ隠し | 3 | 4.48 |
| 傾斜 | 3 | 4.47 |
| 命に関わる | 3 | 4.66 |
| 高が | 3 | 3.91 |
| 期日 | 3 | 4.71 |
| 眉 | 3 | 3.26 |
| 緩やか | 3 | 3.90 |
| 巻き付く | 3 | 4.34 |
| だろうに | 3 | 4.05 |
| 遣られる | 3 | 4.08 |
| 締めて | 3 | 4.34 |
| 子供の頃 | 3 | 3.96 |
| 遺跡 | 3 | 3.39 |
| 厳守 | 3 | 5.26 |
| 保持 | 3 | 4.11 |
| 申し出る | 3 | 4.15 |
| 宿場 | 3 | 4.78 |
| 処刑 | 3 | 3.74 |
| 干し肉 | 3 | 4.06 |
| 早とちり | 3 | 4.90 |
| パラパラ | 3 | 4.49 |
| 怪しむ | 3 | 4.09 |
| 巻き | 3 | 3.71 |
| 買い手 | 3 | 3.97 |
| 身構え | 3 | 4.32 |
| ものだから | 3 | 3.61 |
| 多々 | 3 | 3.95 |
| 自由意志 | 3 | 5.11 |
| ハック | 3 | 5.43 |
| 出る前 | 3 | 4.46 |
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