Tōka Takanashi, older sister to Rikka, steps into the role of guardian after their father’s passing and Rikka’s rejection of living with their mother. With their grandparents unequipped to manage Rikka’s *chūnibyō* behaviors, Tōka shoulders her sister’s care despite balancing her own career in Italy. Her approach to curbing Rikka’s escapist fantasies often involves blunt physical or verbal interventions, driven by a desire to ground Rikka in reality—especially regarding unresolved grief over their father.

Initially wary of Yuuta Togashi’s influence, Tōka gradually shifts to relying on him, a trust tested in *Take On Me* when she stages a fabricated scheme to relocate Rikka to Italy. This ploy covertly assesses Yuuta’s resolve to support Rikka long-term, aiming to secure her sister’s stability so Tōka can pursue her engagement and marriage to an Italian partner.

In Italy, Tōka works under a superior whose daughter, Cento, visits Japan. Her mentorship of Yumeha Togashi—culminating in selecting Yumeha as a bridesmaid—underscores her nurturing side beyond stern sisterhood. Though her harshness initially masks frustration over deferred personal goals, her actions remain rooted in protectiveness toward Rikka’s future.

Her narrative traces a journey from reluctant guardian to someone who releases control upon ensuring Rikka’s emotional safety through Yuuta’s steadfastness. Tōka’s marriage marks her successful negotiation of self-fulfillment and familial duty, closing her arc with a harmony between individual aspirations and sisterly devotion.