Ijuin, a high-ranking executive at Tamura Productions, originally aligned with the company’s founding leadership, serves as the bearer of life-altering news to the protagonist. During the Grand Opening of Marine Live Stage, he informs her of her father’s fatal car accident and her mother’s coma—a revelation that catalyzes the protagonist’s transformative journey.

When Kosuke Tamura’s controversial rise to power introduces abusive management tactics, Ijuin joins a wave of disillusioned employees who defect from Tamura Productions in protest, signaling systemic unrest within the organization.

Later, he emerges as a key strategist in the protagonist’s liberation from Kosuke’s manipulation, coordinating with allies to secure her escape to an underground training facility. There, she prepares discreetly for her debut, shielded from external interference. Ijuin’s maneuvers during this phase emphasize his dedication to both her safety and her ascent as an artist.

Amid Kosuke’s campaigns to tarnish the protagonist’s reputation through orchestrated scandals and media exploitation, Ijuin collaborates with her supporters to strategize countermeasures. His recurring role in thwarting Kosuke’s schemes underscores a steadfast commitment to safeguarding the protagonist’s future, though his personal history or deeper motivations remain unexplored.