Toshika Jin is the younger sister of Kaito Jin, relocating with him from Tokyo to Nagoya. She attends Tagane High School as a first-year student, placing her age around 16, and shares classes with Monaka Yatogame and Mai Tadakusa. Her birthday is July 1st. Toshika possesses dark blue hair and blue eyes. Her status as a Tokyo native in Nagoya positions her as an observer of regional culture alongside other characters. She appears consistently throughout the anime series, including the fourth season, participating in cultural observations and school activities central to the narrative. Her role remains defined by her familial relationship, her adaptation as a student from Tokyo, and her presence within the ensemble cast exploring Nagoya's identity.