佐々木敦子 佐々木敦子(はめふら)
The only friend [[monkey_girl_(hamefura)|the unnamed girl]] had before ending up reincarnated as [[Katarina Claes]]. Nicknamed "A-chan". 

[spoiler]It is unclear if she, too, was reincarnated as [[Sophia Ascart]], but it is strongly hinted that they might share a connection.[/spoiler]
sasaki atsuko (hamefura)