"Keyaki no Ki" is a manga series that explores themes of family, identity, and the passage of time through the lens of a multigenerational narrative. The story centers around the Keyaki family, whose lives are deeply intertwined with a centuries-old zelkova tree that stands on their ancestral land. The tree serves as a symbolic anchor, representing the family's history, struggles, and resilience.

The narrative begins with Haruto Keyaki, a young man who returns to his rural hometown after the death of his estranged grandfather. Haruto, who had left the family estate years ago to pursue a career in the city, is forced to confront unresolved tensions and buried secrets upon his return. As he reconnects with his family, including his stern father, emotionally distant mother, and younger sister, Haruto begins to uncover the layers of his family's past. The zelkova tree, which has witnessed generations of Keyakis, becomes a focal point for these revelations.

Through a series of flashbacks and interwoven timelines, the story delves into the lives of Haruto's ancestors, revealing how their choices and hardships have shaped the present. Key figures include Haruto's great-grandfather, who planted the tree as a symbol of hope during a time of war, and his grandmother, whose sacrifices during post-war reconstruction left a lasting impact on the family. Each generation's struggles—ranging from economic hardship to personal loss—are intricately tied to the tree, which stands as a silent witness to their joys and sorrows.

As Haruto pieces together his family's history, he begins to understand the weight of his own decisions and the importance of preserving his heritage. The narrative also explores the dynamics between Haruto and his sister, Aoi, who has remained on the family estate and feels a deep connection to the land and the tree. Their evolving relationship highlights themes of responsibility, legacy, and the tension between tradition and modernity.

The story progresses with a blend of emotional depth and quiet introspection, as the Keyaki family grapples with their shared past and uncertain future. The zelkova tree, ever-present and enduring, serves as a metaphor for the family's resilience and the cyclical nature of life. By the end of the series, Haruto and his family come to terms with their history, finding a sense of closure and renewed purpose in their connection to the land and each other.