The Yotsuba family's New Year's Reception brings together potential successors to lead one of magic society's most influential clans. Miyuki arrives knowing that claiming the leadership position could transform her brother Tatsuya's life, freeing him from the stigma that haunts him. Yet the cost of power demands a political marriage, and she wrestles with sacrificing her own future for his sake. The family patriarch drops a revelation that shatters everything: Miyuki may not actually be Tatsuya's biological sister. The claim fractures the foundation of her identity and threatens to redefine their bond entirely. As competing candidates maneuver through the succession trials, Miyuki must navigate impossible choices between duty to her clan, her relationship with Tatsuya, and discovering who she truly is. Political intrigue, family secrets, and high-stakes magic combat collide as the new year dawns. What began as a simple succession contest becomes a reckoning that could forever alter the relationship at the story's emotional core.