On the way back from buying a birthday present for his younger sister, the protagonist gets into an accident. He is then reincarnated as an extraterrestrial life form and goes to Earth to investigate, infiltrate, and prevent an invasion by aliens.
| Word | Frequency | Difficulty |
|---|---|---|
| する | 8 | 1.24 |
| と | 8 | 0.77 |
| 俺 | 8 | 1.41 |
| いる | 9 | 1.00 |
| だ | 10 | 1.16 |
| で | 10 | 0.86 |
| は | 18 | 0.48 |
| て | 23 | 0.56 |
| を | 23 | 0.41 |
| に | 26 | 0.54 |
| が | 27 | 0.48 |
| の | 31 | 0.28 |
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