I Want to Eat Your Pancreas, the coming-of-age novel! A high school boy finds the diary of his classmate—only to discover that she’s dying. Yamauchi Sakura has been silently suffering from a pancreatic disease, and now exactly one person outside her family knows. He swears to her that he won’t tell anyone what he learned, and the shared secret brings them closer together in this deeply moving, first-person story that traces their developing relationship in Sakura’s final months of life.

【Plot summery】 (from Wikipedia)Haruki comes across a book in a hospital waiting room. He soon discovers that it is a diary kept by his very popular classmate, Sakura, who reveals to him that she is secretly suffering from a fatal pancreatic illness. Despite this, Sakura intends to maintain a normal school life, and thus is drawn to Haruki due to his relatively unfazed reaction to her condition. They begin to spend time together and become friends.One school break, Sakura invites Haruki on a train trip to Fukuoka during which the two play truth-or-dare and eventually share a bed in their hotel. Afterwards, Sakura's friends and classmates grow suspicious and resentful of Haruki's newfound closeness to her. The two begin doing activities from Sakura's bucket list together, until Sakura is suddenly hospitalized. During her hospitalization, the two sneak out to see fireworks together. When Sakura is discharged she messages Haruki inviting him to lunch, but does not show up at their meeting spot. Later that night, Haruki is watching the news with his family, which reveals that Sakura was stabbed on her way to meet him and that she is dead. He breaks down and does not attend her funeral.Later, he visits her mother and asks for Sakura's diary. Her mother recognizes him, and reveals Sakura left a letter for him. The letter tells him to keep the diary and to make her best friend Kyoko read it, as she was unaware of Sakura's illness and hated Haruki. Soon after Haruki reads the letter, he immediately breaks down into tears as he never felt so much sorrow for a single person before. Before leaving, Sakura's mother asks for his name. He replies "Haruki" to which she replies, "so you two were meant to be," explaining the meaning of their names, Haruki (spring trees) and Sakura (cherry blossom). He meets with Kyoko, who is in denial that Sakura ever lied to her, but after reading the diary she runs away. Haruki runs after and asks her to be his friend, for it was Sakura who made him open up to people and he wants to honor her memory. The movie ends with Haruki and Kyoko visiting Sakura's grave a year later, the two of them having become friends.