Misaki, twenty-five and preparing for marriage, discovers an old photograph and a broken pocket watch among her late father's belongings. Her father worked his entire life as a railway employee at Tokyo Station. Her memories paint him as a strict, severe figure, especially during her teenage years, leading to regret over their emotional distance.

The photograph challenges her view, capturing her father with a warm smile—an expression she never saw—as she embraced him from behind while he readied for work. This prompts her to reconsider her understanding of him. Driven to comprehend him better, she seeks to repair the pocket watch, originally her grandfather's, then her father's. Her mother tells her she can keep the watch regardless of repair.

Her quest takes her to Tokyo Station. Searching for a watch repair shop once located there, she observes station employees diligently assisting travelers. Witnessing their care sparks a realization about the effort her father likely dedicated to his role. During her visit, she glimpses a station employee who strongly resembles her father, compelling her to impulsively follow.

She finds the watch shop and meets the shopkeeper. This person shares fond memories, revealing unknown facets of her father's personality and life. Through these recollections, Misaki gains new insights into his character, relationships, and the commitment he balanced between family and station duties.

This journey reshapes her perspective. She moves beyond seeing him solely as stern and distant, coming to understand him as a responsible, caring individual whose actions were shaped by dedication. This resolution brings emotional closure and peace regarding their relationship, allowing her to approach her marriage with greater satisfaction and a more complete understanding of her father's legacy.