Kasumi serves as a narrative foil to the protagonist, Joker. While Joker is a transfer student burdened by a criminal record, Kasumi is a transfer student celebrated for her athletic potential. Despite her "model student" image, she is often isolated due to the high expectations placed upon her, forming a unique bond with the protagonist based on their shared status as outsiders. The Identity Twist: Kasumi vs. Sumire
Maruki used his cognitive powers to "overwrite" Sumire's personality, making her believe she actually was Kasumi so she could escape her trauma and live out her sister's dream. Role in the Phantom Thieves Yoshizawa Kasumi
The real Kasumi died in a car accident while saving Sumire from being hit. Kasumi serves as a narrative foil to the protagonist, Joker