Saeko Toba, mother of Matsuri Toba and wife of Seichiro Toba, is the daughter of Sukaza Ryudo—grandfather of the Ryudo brothers—and thus their aunt. Her marriage to Seichiro appears driven by his ambition to seize control of Kyowa College, the institution her father founded, rather than genuine affection.

Enduring her husband’s greed and manipulative tendencies, Saeko navigates strained family dynamics while maintaining a quiet resilience. Though the Ryudo brothers despise Seichiro for his antagonism, they deeply respect Saeko, treating her with unwavering deference. This contrast underscores her role as a unifying maternal figure, sustaining a supportive bond with the brothers despite their clashes with her husband.

When antagonists target the Ryudo siblings’ dragon heritage, Saeko and her family are taken hostage, exposing her precarious position within the conflict. Her kidnapping by Dr. Hatushi Tamozawa, a sadistic ally of the antagonists, galvanizes the brothers to intervene, showcasing their protective loyalty and her subtle yet pivotal influence on their choices.

Saeko’s character is anchored in her familial connections: a bridge between the Ryudo brothers’ legacy and Seichiro’s scheming ambitions. Her presence in critical narrative moments tests the brothers’ resolve, reinforcing her role as both a catalyst and a fragile link in their shared history.