Ryuka graduated from an all-boys boarding school and returned home to prepare for university. He learns that his mother and Keita, his childhood friend from kindergarten, have somehow developed a physical relationship, and he is told that a younger sibling will soon be born to him. Thus, Ryuka's university life becomes consumed by childcare.
| Word | Frequency | Difficulty |
|---|---|---|
| へ | 5 | 1.95 |
| 布団 | 5 | 3.68 |
| こんな | 5 | 2.33 |
| お前 | 5 | 2.16 |
| 寝る | 5 | 3.20 |
| 2人 | 6 | 2.98 |
| その | 6 | 1.44 |
| 旅行 | 6 | 3.86 |
| あいつ | 6 | 2.86 |
| 好き | 6 | 2.59 |
| え | 6 | 2.39 |
| 蓮 | 6 | 3.84 |
| 子 | 6 | 2.51 |
| ば | 6 | 1.60 |
| 出 | 6 | 2.33 |
| でも | 6 | 1.70 |
| のに | 6 | 2.21 |
| まで | 6 | 1.84 |
| ずっと | 6 | 2.68 |
| 来 | 6 | 2.47 |
| 今 | 6 | 1.97 |
| 母親 | 6 | 3.18 |
| のか | 6 | 1.74 |
| し | 7 | 1.60 |
| 帰る | 7 | 2.52 |
| 丁 | 7 | 2.44 |
| 日向 | 7 | 4.38 |
| 昔 | 7 | 2.93 |
| 中 | 7 | 1.86 |
| 見る | 7 | 2.00 |
| には | 7 | 1.57 |
| 良い | 7 | 2.17 |
| 歩 | 7 | 3.66 |
| 見 | 7 | 1.96 |
| られる | 8 | 1.68 |
| さ | 8 | 1.59 |
| 手 | 8 | 1.97 |
| 大学 | 8 | 3.68 |
| くれる | 8 | 1.97 |
| 入る | 8 | 2.14 |
| いる | 9 | 1.00 |
| んだ | 9 | 1.80 |
| ても | 9 | 1.96 |
| する | 9 | 1.24 |
| 思う | 10 | 1.61 |
| って | 10 | 1.78 |
| 居る | 10 | 2.39 |
| まま | 10 | 2.40 |
| 来る | 10 | 2.08 |
| 顔 | 11 | 1.91 |
| 言う | 12 | 1.56 |
| して | 13 | 1.31 |
| 無い | 13 | 2.25 |
| けど | 14 | 1.79 |
| れる | 14 | 1.22 |
| 伯父さん | 14 | 3.54 |
| 〜 | 15 | 3.21 |
| 母 | 15 | 2.96 |
| 伯母さん | 15 | 3.90 |
| だ | 16 | 1.16 |
| 下 | 16 | 1.38 |
| 板 | 18 | 1.29 |
| 家 | 18 | 2.15 |
| な | 20 | 1.04 |
| だった | 20 | 1.58 |
| 和 | 21 | 3.72 |
| よ | 22 | 1.48 |
| なる | 23 | 1.37 |
| 事 | 24 | 1.75 |
| てる | 26 | 1.65 |
| 双子 | 26 | 3.69 |
| も | 28 | 1.04 |
| 太 | 29 | 3.35 |
| 敬 | 29 | 4.98 |
| 華 | 36 | 3.54 |
| 流 | 36 | 3.55 |
| から | 40 | 1.17 |
| 俺 | 54 | 1.41 |
| で | 59 | 0.86 |
| は | 75 | 0.48 |
| が | 90 | 0.48 |
| と | 102 | 0.77 |
| に | 136 | 0.54 |
| を | 136 | 0.41 |
| て | 145 | 0.56 |
| の | 163 | 0.28 |
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