The anime centers on sea otter brothers Anira and Kokora, who live at a certain aquarium. Anira is the older brother who is cool, but also has a naive side. The younger brother Kokora is a passionate otter who adores his older brother. (Source: Anime News Network)
| Word | Frequency | Difficulty |
|---|---|---|
| 可 | 166 | 3.68 |
| の | 83 | 0.28 |
| 尼 | 82 | 4.71 |
| 阿 | 82 | 4.20 |
| 与 | 76 | 4.32 |
| 的 | 63 | 2.51 |
| て | 60 | 0.56 |
| 是 | 56 | 3.12 |
| 海 | 44 | 2.90 |
| グッド | 33 | 5.21 |
| らっこ | 33 | 6.32 |
| だ | 30 | 1.16 |
| ー | 30 | 2.29 |
| が | 28 | 0.48 |
| 毎日 | 26 | 3.21 |
| 漂う | 26 | 3.32 |
| に | 25 | 0.54 |
| は | 25 | 0.48 |
| 好 | 23 | 3.55 |
| から | 22 | 1.17 |
| 不 | 21 | 2.72 |
| を | 21 | 0.41 |
| こと | 19 | 1.30 |
| な | 19 | 1.04 |
| 在 | 18 | 3.53 |
| で | 18 | 0.86 |
| 我 | 18 | 2.82 |
| 冬 | 18 | 3.20 |
| 都 | 17 | 3.29 |
| そんな | 16 | 1.84 |
| 野生 | 16 | 3.95 |
| 寒い | 15 | 3.54 |
| 血が騒ぐ | 15 | 5.37 |
| 中 | 14 | 1.86 |
| 暑い | 14 | 3.77 |
| てる | 14 | 1.65 |
| では | 14 | 1.75 |
| 食べる | 13 | 2.42 |
| 新しい | 13 | 2.99 |
| だらけ | 13 | 3.54 |
| よ | 13 | 1.48 |
| 僕ら | 13 | 3.51 |
| マイルール | 13 | 6.32 |
| 夏 | 13 | 3.28 |
| も | 13 | 1.04 |
| と | 12 | 0.77 |
| 个 | 12 | 3.70 |
| 只 | 11 | 3.85 |
| 毛 | 11 | 3.69 |
| 后 | 11 | 3.93 |
| 石 | 11 | 2.85 |
| 每 | 11 | 4.83 |
| 天 | 11 | 3.01 |
| 狂 | 10 | 3.65 |
| 下 | 10 | 1.38 |
| 兄弟 | 10 | 3.59 |
| 里 | 10 | 3.22 |
| ぞ | 10 | 2.08 |
| 之 | 10 | 3.57 |
| 一 | 10 | 2.47 |
| 血 | 9 | 2.71 |
| 着 | 9 | 2.95 |
| 真 | 9 | 3.25 |
| ホタテ | 9 | 5.13 |
| なんて | 9 | 2.13 |
| か | 9 | 1.46 |
| し | 8 | 1.60 |
| 用 | 8 | 2.75 |
| んだ | 8 | 1.80 |
| 了 | 8 | 3.23 |
| けど | 8 | 1.79 |
| って | 8 | 1.78 |
| 也 | 8 | 3.54 |
| 野 | 8 | 3.86 |
| ね | 8 | 1.64 |
| ない | 8 | 1.61 |
| じゃない | 8 | 2.26 |
| ラッコ | 8 | 5.38 |
| 感 | 8 | 3.39 |
| 容 | 7 | 4.12 |
| 大海 | 7 | 4.74 |
| 寒 | 7 | 4.51 |
| 无 | 7 | 3.96 |
| 得 | 7 | 2.96 |
| 去る | 7 | 3.02 |
| ここら | 7 | 4.17 |
| 因 | 7 | 4.31 |
| 扇 | 6 | 4.09 |
| 何 | 6 | 2.09 |
| 地 | 6 | 2.92 |
| 深海 | 6 | 4.52 |
| 来 | 6 | 2.47 |
| これ | 6 | 2.15 |
| 和 | 6 | 3.72 |
| 前 | 6 | 2.31 |
| 人間 | 6 | 2.21 |
| 本 | 6 | 2.87 |
| なる | 6 | 1.37 |
| 割る | 6 | 3.54 |
| 活 | 6 | 4.34 |
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