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Fast forward to 2015, William's daughter, Kate Ronda, finds herself in Tokyo, grappling with the trauma of her past after surviving an attack by Titans. In her father's old apartment, she discovers a shocking truth: her father had a secret life and another family in Japan. This revelation devastates her, forcing her to reassess her understanding of family and loyalty.

The Siblings Unite

As Kate delves deeper into her father's history, she connects with her half-brother, Kanaro. Together, they uncover tapes and documents revealing their father's connection to Monarch, the organization engaged in studying and managing Titan threats. Motivated by their discoveries, they embark on a mission to find William and understand their past.