Akane Hiyama

As the beloved school idol, this girl appears to be the perfect romantic interest for Seiji, yet a terrifying yandere side lurks beneath her charming exterior. Despite having a different surname, she shares a close familial bond as the older sister of Yuzu Kichougasaki. Her deceptive sweetness masks a dangerous obsession that drives much of the story's tension, making her far more than just a simple crush.