Meet Yumiko Sato, a former Japanese financial executive who escaped the clutches of the Yakuza after uncovering a web of fraud. Now, she stands as Leonardo's main ally and confidante in his investigation of the Castle's enigmatic secrets. With her intelligence, courage, and unwavering pursuit of truth, Yumiko not only aids Leonardo in unraveling the mysteries that surround them but also shares a deep-rooted connection to his past, adding an extraordinary layer of destiny to their journey. Together, they navigate the shadows, seeking revelations that could change everything.