ASTER IS A GIRL IT WAS CONFIRMED IN THE EARLY CHAPTERS WHEN THE RED HAIRED DUDE WAS INTRODUCED (Our main character says if the red haired dude gets attracted to aster we just gotta show him her chest cause the red haired dude is only attracted to men)
Comment by Shiroe on If You Lay A Hand On My Brother, You're All Dead - Chapter 41
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@Shiroe also when rosalitte got her period aether said that she also go's through the same cycle