Sumire Miyazaki

Sumire is a junior waitress at the same cosplay restaurant where Sato works, and the two share neighboring apartments, making their entanglement all the more intimate. Plagued by a deep sense of ordinariness, she becomes fixated on Sato to an unhealthy degree—meticulously copying her fashion and mannerisms in a desperate attempt to feel special. Her obsession eventually leads her to secretly rifle through Sato's locker and inhale the scent of her uniform. When discovered, Sato responds not with anger but with a calculated kiss, effectively drawing Sumire under her influence. She serves as a key supporting character illustrating the series' themes of distorted affection and psychological manipulation.