Junji Ito's Souichi is probably based on Tatari.
She's the OG!
Both were first published in 1991 so idk.
Plus, the dynamic of the stories are wildly different for me. Soichi is framed as the villain, the reader gets satisfaction from seeing the ways the spells backfires. As for Tatri, the satisfaction comes from her succeeding in her revenge
Tried to look up anything online on it, Inuki does speak about having influenced Hideshi Hino (and vice versa) but I couldnt find anything were she talks about having influenced Ito
So to me, it's just "two artists exploring a similar concept in the same timeframe in different ways" rather than one inspiring the other