Sakura Yamauchi, a 17-year-old high school student, navigates life with a terminal pancreatic illness and a prognosis of one year remaining. Her light brown hair falls in long bangs around her face, framing small hazel eyes and a slender frame. She favors her school uniform—a pale beige blazer over a white shirt, accented by a blue bow, pleated skirt, and dark grey socks—or casual attire beyond campus.

Exuding cheerfulness, Sakura laughs loudly and radiates energy, though this vivacity cloaks a deep-seated fear of mortality. Her diary, occasionally titled *Living with Dying*, chronicles her determination to accept her condition rather than fight it, focusing on savoring each day. She devours books, especially *The Little Prince*, which she loans to a peer, and draws inspiration from historical figures like diplomat Chiune Sugihara.

A bond forms when a withdrawn classmate discovers her diary in a hospital. Their friendship blossoms through shared meals, travels, and truth-or-dare games, where Sakura nudges him toward openness. Despite her lively exterior, she confides fears of dying and seeks solace in private moments. A pivotal trip culminates in a hotel stay marked by raw conversations and a fleeting romantic moment she deflects with humor.

Her anticipated decline is upended when a random stabbing abruptly claims her life post-hospital discharge. Left unresolved, her absence reverberates among loved ones. After her death, her diary surfaces, disclosing concealed emotions and a plea for her friend Kyoko to read it, mending fractured bonds.

Her name, evoking cherry blossoms, mirrors themes of ephemeral beauty and renewal, aligning with the protagonist’s spring-linked name. Through her writings and enduring influence, Sakura’s legacy urges others to treasure fleeting connections and embrace life’s transient grace.