Yui

Yui is Akira's twin elder brother, sharing the exceptionally rare bloodline of male snow spirits. Confronted with the village's merciless ancient customs, he shouldered every burden alone, enduring years of silent suffering to shield his younger brother from harm. However, after awakening the power of the 'Zero-Knot Stone,' his devotion twisted into something far more extreme — he became convinced that encasing the entire world in eternal ice was the only way to grant Akira absolute and everlasting protection. Yui stands as a tragic figure whose love and obsession have become inseparable, a soul tormented yet unwaveringly devoted to the one he holds dearest.