A high school student named Tsukiko's sister, Tommy, dies in an accident. However, a year later, Tommy mysteriously returns home, but her behavior and appearance are strange and aggressive. As the story unfolds, it becomes clear that Tommy is not her real sister, but a supernatural entity with the ability to regenerate and create copies of herself. The entity wreaks havoc on Tsukiko's family and friends, causing them to turn against each other. In the end, Tsukiko is consumed by the entity, and the story concludes with a sense of hopelessness and despair.
Here are the key facts extracted from the text:
1. Tommy is a student and a member of the photography club.
2. Tommy likes to take photos of abandoned buildings.
3. Tommy's sister, Tsukiko, is jealous of Tokyo, who is dating Tommy.
4. A steel cross falls from the top of a building and kills Tommy.
5. One year after Tommy's death, a girl who looks like Tommy appears at the door of Tsukiko's family home.
6. The family is shocked to see Tommy, who has come back to life.
7. Tommy's behavior is strange and aggressive, and she asks her parents to cook something more delicious.
8. Tommy looks at a painting with a photo that her brother took before the accident and says it's trash.
9. Tsukiko realizes that everything is very strange, as if Tommy had thrown her out.
10. Tommy's head is still moving and looking at her family after it was cut off.
11. The father is feeding Tommy's head, which is being kept in a trash can.
12. Tommy's head tells the father to kill his wife so that he can regenerate his body.
13. The father kills his wife and cuts out her tongue, which he feeds to Tommy's head.
14. Tommy starts to regenerate her body and becomes very aggressive.
15. Tsukiko discovers that Tommy is not her real sister and threatens her to stay away from Tokyo.
16. Tommy's tumor head speaks and encourages the judo team to cut off Josie's head.
17. Tsukiko tries to escape from Tommy, but she is chased throughout the school.
18. Tommy's body explodes, but she is still alive and continues to chase Tsukiko.
19. Tsukiko tries to lock herself in a room, but Tommy's head appears and kills her.
20. A giant Tommy head and a centipede with many faces appear and eat the father and mother.
21. Tsukiko's brother tries to scare Tommy away with his camera flash and decides to reason with her.
22. Tommy wants her brother to join her, and Tsukiko mentions that she is the only one who understands her.
23. The next day, Tsukiko's brother goes for a walk dressed as Tommy and sees many girls with Tommy's face.
24. He meets a guy who takes him to his apartment, where he is stabbed by the man.
25. When Tsukiko's brother looks in the mirror, he sees Tommy's reflection, and they both end up laughing.