※This work has been novelized by Mag Garden※ Mikanaagi Rio is an ordinary 13-year-old boy who describes himself as average and unremarkable. To participate in his usual repetitive daily life, he steps out through his home's front door, but instead of the familiar gate, he finds himself in an endlessly white world. And waiting there is an arrogant ball of light that claims to be a god. The god's request is simple: "Please save this world that has reached a dead end." Rio is bewildered by this plea, which seems to have been directed at the wrong person. However, upon hearing the words "magic and monsters exist," he nods in agreement and heads toward his destination—the harsh otherworld of Sphere, where death flags flutter ominously at every turn. Yet the god who made this plea for salvation grants him no special powers whatsoever. He is given no information about the problems he must solve, with his only information being the unhelpful fact that he is "the weakest 13-year-old in the world." Bound by countless restrictions and constraints, a story of trial and error for survival begins.
| Word | Frequency | Difficulty |
|---|---|---|
| 熱伝導率 | 1 | 6.18 |
| 迷子 | 1 | 4.07 |
| 突っこむ | 1 | 4.63 |
| 報告例 | 1 | 6.22 |
| 丸くなって | 1 | 4.65 |
| 浮浪者 | 1 | 4.73 |
| 襲来 | 1 | 4.27 |
| 退団 | 1 | 5.48 |
| 撚る | 1 | 5.81 |
| 冷 | 1 | 4.61 |
| 元に戻る | 1 | 4.42 |
| ウィンド | 1 | 4.37 |
| 眉唾もの | 1 | 5.54 |
| 入れ替わり立ち替わり | 1 | 5.57 |
| 堪る | 1 | 4.19 |
| 散らかる | 1 | 4.65 |
| ごとり | 1 | 5.53 |
| あの様に | 1 | 4.54 |
| 騎 | 1 | 3.51 |
| 流れ落ちる | 1 | 4.35 |
| 噛み切る | 1 | 5.47 |
| 帝座 | 1 | 5.10 |
| 屋根裏 | 1 | 4.87 |
| 家人 | 1 | 3.99 |
| 知らず知らず | 1 | 4.61 |
| 講座 | 1 | 4.67 |
| 真っ赤な嘘 | 1 | 5.52 |
| 商店 | 1 | 4.05 |
| 居つく | 1 | 5.56 |
| 携行 | 1 | 4.90 |
| 小山 | 1 | 4.56 |
| 苛つく | 1 | 5.36 |
| あるかないか | 1 | 4.86 |
| 蛙の子は蛙 | 1 | 6.21 |
| 不要物 | 1 | 6.04 |
| 労使 | 1 | 4.84 |
| 叩き出す | 1 | 5.11 |
| 改名 | 1 | 4.96 |
| 退き時 | 1 | 6.21 |
| すれすれ | 1 | 4.68 |
| 一朝一夕 | 1 | 4.74 |
| 映画化 | 1 | 5.96 |
| 超一流 | 1 | 4.57 |
| 国際通貨 | 1 | 6.89 |
| 湿布 | 1 | 5.14 |
| 刃傷沙汰 | 1 | 5.17 |
| 国語 | 1 | 4.85 |
| 成鳥 | 1 | 5.83 |
| 抽選会 | 1 | 6.20 |
| 参考資料 | 1 | 5.50 |
| 追い求める | 1 | 4.60 |
| 不注意 | 1 | 4.88 |
| 伸び上がる | 1 | 5.03 |
| 自傷 | 1 | 5.30 |
| 成り果てる | 1 | 5.18 |
| 肚 | 1 | 5.22 |
| 長柄 | 1 | 4.67 |
| 縦置き | 1 | 7.11 |
| 重々しい | 1 | 4.11 |
| 骨片 | 1 | 5.60 |
| 引 | 1 | 4.66 |
| 勝てば官軍 | 1 | 5.84 |
| 神経を使う | 1 | 5.28 |
| 差し物 | 1 | 4.48 |
| 元も子もない | 1 | 4.74 |
| 激闘 | 1 | 4.60 |
| 矮小 | 1 | 4.67 |
| それはどうかな | 1 | 5.25 |
| テニスラケット | 1 | 6.31 |
| 運転免許証 | 1 | 6.11 |
| 人車 | 1 | 6.24 |
| より良い | 1 | 4.34 |
| 定員 | 1 | 4.02 |
| おちょくる | 1 | 4.80 |
| でっち上げ | 1 | 4.83 |
| 必要最低限 | 1 | 4.50 |
| 行って来い | 1 | 4.99 |
| 立ち入り禁止 | 1 | 4.64 |
| 何故かと言うと | 1 | 5.29 |
| 通告 | 1 | 4.85 |
| ばんばん | 1 | 5.15 |
| 生来 | 1 | 4.52 |
| 追放 | 1 | 3.96 |
| こんがらがる | 1 | 5.05 |
| 説明文 | 1 | 4.75 |
| 転校 | 1 | 4.65 |
| 希少金属 | 1 | 5.28 |
| 公務員 | 1 | 4.89 |
| 羽織 | 1 | 4.68 |
| 傍から | 1 | 4.04 |
| 乾物 | 1 | 4.80 |
| 死蔵 | 1 | 5.00 |
| 待望 | 1 | 4.84 |
| 揺すり | 1 | 5.12 |
| 原っぱ | 1 | 5.06 |
| 売買契約 | 1 | 5.52 |
| 私室 | 1 | 4.19 |
| 笛 | 1 | 4.11 |
| シャワーを浴びる | 1 | 5.36 |
| 衛生 | 1 | 4.69 |
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