Elisa Chen, a 20-year-old third-year student at a clandestine magic school for superheroes, navigates a dual life with an intensity that belies her youthful appearance. By day, she attends a regular high school, blending in with her peers, her ice-blue eyes often mistaken for a mere reflection of her cool demeanor. By night, she transforms into a student of the arcane, mastering her ice magic at the secret institution. Her powers, while formidable, cast a shadow over her true nature; to those who don't know her well, she seems cold and calculated. Yet, those closest to her cherish her kindness and caring nature, a vulnerability that has been exploited in the past, leaving her wary yet hopeful.

Her life takes a dramatic turn when she discovers that her best friend, under the guise of a fellow hero, is actually the city's main villain, wielding the sinister power of blood manipulation. This revelation shatters Elisa's world, pushing her into a spiral of madness and detachment. Her once light icy blue eyes deepen to a mid-light blue, mirroring the storm within. Abandoning her classes and dorm, she emerges as a vigilante, her actions driven by a newfound ruthlessness and a chilling resolve.

Elisa's closest friends, a male and female hero, are left to grapple with her transformation. They embark on a quest to understand her descent into vigilantism, hoping to bring her back from the brink. As they navigate the complexities of heroism and betrayal, they confront not only the external threats to their city but also the internal turmoil that threatens to tear their group apart.

Elisa's unique trait is her habit of twirling a strand of her jet-black hair when deep in thought, a gesture that betrays her otherwise composed exterior. Her attire shifts from the casual jeans and hoodies of her day life to the sleek, dark combat gear of her vigilante persona, symbolizing her internal shift from warmth to icy resolve.