"Evergreen" is a manga series that blends elements of romance, drama, and supernatural themes. The narrative centers around Yayoi, a high school student who moves to a rural town to live with her grandmother after her parents' divorce. The town is shrouded in mystery, with legends of a sacred tree that grants wishes but demands a heavy price in return. Yayoi, initially skeptical of these tales, begins to experience strange occurrences that challenge her understanding of reality.

The story unfolds as Yayoi encounters Yuu, a mysterious boy who claims to be the guardian of the sacred tree. Yuu warns Yayoi about the dangers of meddling with the tree's powers, but her curiosity and desire to fix her fractured family lead her to make a wish. This decision sets off a chain of events that intertwines her fate with the tree and its dark history. As Yayoi delves deeper into the town's secrets, she uncovers the tragic past of those who came before her, including Yuu's own connection to the tree.

The relationship between Yayoi and Yuu becomes a focal point of the narrative, evolving from mistrust to a complex bond as they navigate the consequences of Yayoi's wish. The story explores themes of sacrifice, the weight of choices, and the blurred line between reality and myth. Supporting characters, such as Yayoi's classmates and townsfolk, add depth to the narrative, each with their own ties to the tree and its legends.

As the plot progresses, Yayoi must confront the moral and emotional dilemmas posed by the tree's power, ultimately leading to a climactic resolution that tests her resolve and understanding of love and loss. The manga balances its supernatural elements with heartfelt character development, creating a compelling and emotionally resonant story.