The Wolf & The Ice Queen

Entering their third and final year at the Advanced Nurturing High School, the battle for Class A has reached its peak. When a mysterious late-night break-in threatens the campus, Student Council President Suzune Horikita makes it her personal mission to catch the culprit-a search that leads her straight to Kakeru Ryuuen.
But Ryuen has no intention of playing along. He never has. In order to keep secrets buried, he needs to get her out of the way first.
Yet, as Horikita pushes past his walls and Ryuen challenges her boundaries at every turn, their dangerous proximity begins to shift. Amidst the chaos of the school's ruthless exams, secretes and high school life, their bitter rivalry gives way to an unexpected journey of emotional growth, terrifying firsts, and the ultimate willingness to admit to their own hearts what they truly want.

There's some spoilers so be warned.