けが
injury
Something strange has happened to your own body, which is a very Japanese way of putting it. Her arm, this time, and a keg けが went over on it: けが.
The characters are borrowed for sound. There is nothing to read out of 怪 strange and 我 self.
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Emaki is not affiliated with, or endorsed by, Kaishi 1.5k or its authors. The word, reading and meaning come from the Kaishi 1.5k deck, used with their permission. The mnemonic, the note and the kanji breakdown are original work, published under CC BY-SA 4.0.