In the near future, a sudden and unexplained sea rise has left much of human civilization underwater. Ikaruga Natsuki, a boy who lost his mother and one of his legs in an accident some years earlier, returns disillusioned from a harsh life in the big city to find his old countryside home half-swallowed by the sea. Left without a family, all he has to his name is the ship and submarine left to him by his oceanologist grandmother, and her debts. His only hope to restore the dreams for the future that he has lost is to take up an opportunity presented to him by the suspicious debt collector Catherine. They set sail to search the sunken ruins of his grandmother's laboratory in order to find a treasure rumor says she left there. But what they find is not riches or jewels; it is a strange girl lying asleep in a coffin at the bottom of the sea, Atri. Atri is a robot, but her appearance and her wealth of emotions would fool anyone into thinking she's a living, breathing human being. In gratitude for being salvaged, she makes a declaration to Natsuki. (Source: Crunchyroll)
| Word | Frequency | Difficulty |
|---|---|---|
| 複雑 | 1 | 3.34 |
| 文句 | 1 | 3.23 |
| 発売 | 1 | 3.77 |
| 出来れば | 1 | 3.04 |
| 著しく | 1 | 4.33 |
| 不自然 | 1 | 3.62 |
| 本物 | 1 | 3.31 |
| 野放し | 1 | 4.55 |
| 集める | 1 | 3.30 |
| アラート | 1 | 5.18 |
| 性 | 1 | 3.53 |
| 繋がり | 1 | 3.49 |
| 卵 | 1 | 3.41 |
| 定番 | 1 | 3.98 |
| 手助け | 1 | 3.93 |
| 抑え込む | 1 | 4.17 |
| マスタード | 1 | 5.03 |
| 愛 | 1 | 3.07 |
| またまた | 1 | 4.50 |
| やり遂げる | 1 | 4.39 |
| 自ら | 1 | 2.87 |
| 廃虚 | 1 | 5.76 |
| 日本 | 1 | 3.01 |
| 解く | 1 | 3.30 |
| 大人になる | 1 | 4.63 |
| 好きなように | 1 | 4.28 |
| 発達 | 1 | 4.08 |
| お帰り | 1 | 3.67 |
| 面倒を見る | 1 | 4.46 |
| 一致 | 1 | 3.86 |
| 場合 | 1 | 2.60 |
| ちゃいます | 1 | 4.08 |
| 続く | 1 | 2.90 |
| とすると | 1 | 3.56 |
| 数年 | 1 | 3.75 |
| ふふん | 1 | 4.08 |
| 何かあったの | 1 | 3.93 |
| 悔しい | 1 | 3.38 |
| 今では | 1 | 3.48 |
| 光る | 1 | 3.26 |
| 知り合い | 1 | 3.31 |
| 最新 | 1 | 4.09 |
| 発電所 | 1 | 5.49 |
| 出し合う | 1 | 4.85 |
| 後悔 | 1 | 3.30 |
| 今までにない | 1 | 4.56 |
| 鼻歌 | 1 | 4.33 |
| か月 | 1 | 4.12 |
| 頁 | 1 | 3.69 |
| 已に | 1 | 2.85 |
| 手入れ | 1 | 3.12 |
| 意地悪 | 1 | 3.91 |
| 申し分ない | 1 | 4.47 |
| 追い出す | 1 | 3.77 |
| 都合 | 1 | 3.56 |
| 海洋学者 | 1 | 7.42 |
| 目指す | 1 | 3.30 |
| その足で | 1 | 4.53 |
| 演技 | 1 | 3.74 |
| それなりに | 1 | 3.17 |
| 型番 | 1 | 5.73 |
| くらいなら | 1 | 3.63 |
| 保護法 | 1 | 5.94 |
| 考え方 | 1 | 3.72 |
| 計算 | 1 | 3.48 |
| 受け取る | 1 | 3.03 |
| 正体 | 1 | 3.33 |
| 5つ | 1 | 4.44 |
| 落ち着き | 1 | 3.71 |
| 本番 | 1 | 3.96 |
| 被害 | 1 | 3.14 |
| 四大 | 1 | 4.19 |
| 生まれてくる | 1 | 4.47 |
| 席 | 1 | 2.98 |
| 始まる | 1 | 2.93 |
| 今にも | 1 | 3.62 |
| 読み書き | 1 | 4.28 |
| たら | 1 | 3.78 |
| 念のため | 1 | 3.66 |
| ままに | 1 | 3.37 |
| クンクン | 1 | 5.10 |
| 小さいころ | 1 | 4.88 |
| 居なくなる | 1 | 4.05 |
| 信用できる | 1 | 4.31 |
| のんびり | 1 | 3.46 |
| 購入者 | 1 | 5.13 |
| お友達 | 1 | 3.90 |
| 瞬間 | 1 | 2.61 |
| 遠く | 1 | 3.08 |
| 筋 | 1 | 3.68 |
| 伝わる | 1 | 3.09 |
| 意識的 | 1 | 4.59 |
| に付け | 1 | 3.88 |
| 高感度 | 1 | 5.86 |
| 抱き締める | 1 | 3.91 |
| バースデイ | 1 | 5.50 |
| 気休め | 1 | 4.65 |
| 照らす | 1 | 3.40 |
| 何とかして | 1 | 3.87 |
| 宇宙ステーション | 1 | 5.54 |
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