兄妹けいまい
keimai

Noun

1. older brother and younger sister

「でも、俺おれたち兄妹きょうだいだろ!」「名目めいもくじょうではね」
"demo oretachi kyōdaidaro!" "mēmokujōdewane"
"But we're brother and sisters, aren't we?!" "In name we are."
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