いもうと
younger sister
A woman and not-yet, because she is not one, whatever she tells you. Ee い, mo も, and out うと she goes to primary school under a satchel bigger than she is: いもうと.
Your own younger sister; someone else's is 妹さん. Shares its ending with 弟 おとうと.
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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.