Not featured in the provided plot summaries. No direct narrative role or cross-film development can be established from the given material.
Yuuka joins the succession race alongside Miyuki, forming a tentative alliance of candidates.
Direct competitors vying for the same political position and clan authority.
Yuuka maintains a cooperative relationship with Tatsuya to counterbalance Yotsuba internal pressures.
Katsushige provides Yuuka with strategic counsel to secure her position in the succession race.