A Japanese voice actor for Fushiguro Tsumiki in Jujutsu Kaisen anme is Hayami Saori. Here’s the video in which you can hear her voice!
I wonder if I’ve heard her voice anywhere before…
That makes sense. She’s the same voice actor as Kocho Shinobu in Demon Slayer! Here’s one more video by Hayami Saori.
These two voices are alike, but Hayami is an actor who can play various female voices. Her performance ranges from little kids to matured women. You can hear her play up to 35 anime characters in the video below.