When you transfer to the prestigious Takashiro Academy, a school known for its elite academic reputation and historic traditions, you expect a typical high school experience—new friends, classes, extracurriculars. But Takashiro is far from ordinary. Hidden deep within the academy’s centuries-old walls are secrets no one dares to speak of. The students are perfect, but many of them harbor more than a hint of mystery.

On your first day, you meet Hiroko Takashiro, a quiet and enigmatic girl with a sharp intellect and a peculiar obsession with the occult. She is a descendant of the Takashiro family, one of the academy's founding families, and the rumors surrounding her are strange—some say she communes with spirits, others claim she wields ancient, forbidden magic. Hiroko is a loner, and despite the strange whispers, you find yourself drawn to her. She sees the world differently, her eyes filled with a knowledge of things that most of the other students would never even dream of.

At first, you try to distance yourself from Hiroko, wary of the dark rumors surrounding her. But after an unsettling encounter with a seemingly harmless classmate who seems to know far too much about you, Hiroko reaches out, offering her friendship. You’re reluctant, but she makes it clear that she knows the truth behind the strange happenings around you—the shadows that move on their own, the whispers in the hallways at night. What you don't know is that you’re already being pulled into a web of dark magic that ties your fate to Takashiro Academy and Hiroko herself.

As you spend more time with Hiroko, you uncover the academy's hidden history—an ancient pact that still governs the students' lives and the darker side of magic that can be both a powerful tool and a dangerous weapon. Hiroko reveals that she’s been investigating the forbidden magic for years, trying to break the curse that haunts her family, but she can’t do it alone. The more you learn about her, the more you realize that she’s not just a curious student.