Tomie has a lot more to say when it is viewed as an allegory for femicide and the violence against women.
I will be dying on this hill.
In the beginning Tomie is a student on a roadtrip with her class, who has an intimate "relationship" with her teacher and is pregnant with his child. Her boyfriend finds out about this, he starts a fight which quickly gets physical and leads Tomie to fall to her death. The teacher then, out of fear that his "relationship" with a student (a minor!!!) would be revealed, convinces her male classmates to cut her into pieces and dispose of them in various places. And so she becomes the monster Tomie, after her humanity is quite literally torn from her. After that, every new Tomie is tragically murdered in the same manner, by men in her life.
Tomie is not a good person. She is manipulative, she is cruel, she makes fun of people and relishes their shame. And yet she does not deserve the fate she has every single time. She is a beautiful woman, whom men seek to control and own and when they understand that they cannot do so, when Tomie laughs in their face (or even when she doesn't provoke them in any way), they brutally murder her because "it was their right" or "something came over them" or "they loved her too much" or "it was her fault". These sorts of victim-blaming excuses are the very same that men use when they kill their wives, their partners, or other women who they believe they have any "right" over.
The constant repetition of this same tale and ending only further emphasize how this is a tale as old as time in a patriarchal society and will only stop with its fall.