In this deeply moving first-person story, an introverted high school boy finds his classmate’s diary—and learns her biggest secret. Yamauchi Sakura is dying from a pancreatic disease and now he is the only one person outside her family to know the truth. The last thing the boy wants is to be her friend, but Sakura’s cheerful demeanor and their shared secret draw them together in this heartrending tale of friendship and mortality.
I Want to Eat Your Pancreas is finished and has 2 Volumes and 10 Chapters. It is also Known as: 君の膵臓をたべたい, KimiSui
Genres: Drama, School Life
Top 10 Manga Like Kimi no Suizou wo Tabetai [2022 List]
10. Jumyou wo Kaitotte Moratta. Ichinen ni Tsuki, Ichimanen de.

A twenty-year-old with little hope for the future discovers a shop that buys lifespan, time, and health. This is a story dealing with the ensuing consequences.
Note:
Volume 2 contains the side story "Sonzai no Iu made mo Nai Karusa".
Volume 3 contains the side story "Chiisana Negai".
I sold my life for ten thousand yen per year. is finished and has 3 Volumes and 18 Chapters. It is also Known as: 寿命を買い取ってもらった。一年につき、一万円で。, Mikkakan no Koufuku, Three Days of Happiness
9. Shigatsu wa Kimi no Uso

Kosei Arima was a piano prodigy until his cruel taskmaster of a mother died suddenly, changing his life forever. Driven by his pain to abandon piano, Kosei now lives in a monotonous, colorless world. Having resigned himself to a bland life, he is surprised when he meets Kaori Miyazono, a violinist with an unorthodox style. Can she teach Kosei not just how to play, but how to start living again?
Your Lie in April is finished and has 11 Volumes and 44 Chapters. It is also Known as: 四月は君の嘘, Shigatsu wa Kimi no Uso
8. Kimi to Tsuzuru Utakata

Shizuku Hoshikawa, a high school girl who lives avoiding contact with people, writes a novel which is accidentally read by her classmate Kaori Asaka. However, when she reads the novel, she ends up saying: "Let's have a love relationship, for the next job…"
Source: MU
The Summer You Were There is finished and has 6 Volumes and 32 Chapters. It is also Known as: 君と綴るうたかた, Ephemeral Spelling With You, Transient Spelling With You
7. Koten-bu Series

Oreki Houtarou is a self-proclaimed "energy-saver" - that is, he will not actively waste energy doing things that aren't necessary. Though he had no interest whatsoever in joining any clubs upon entering Kamiyama High School, he was commanded by his older sister Tomoka to enter the school's Classics Club, which was in danger of getting abolished as all previous members have graduated. Together with his old friends Fukube Satoshi and Ibara Mayaka, as well as the elegantly ladylike and curiously inquisitive Chitanda Eru, the newly reformed Classics Club find themselves involved in all sorts of mystery-solving escapades. Houtarou soon finds out that the Classics Club, as Tomoka has promised, is actually "quite interesting".
Koten-bu Series is currently publishing . It is also Known as: 〈古典部〉シリーズ, Hyouka
6. Mata, Onaji Yume wo Miteita

The story centers on grade schooler Nanoka Koyanagi, who meets a short-tailed cat and three different women as she is out taking a walk. The first woman is Minami, a high schooler whom Nanoka sees has many wounds on her wrist. The second woman is another high schooler, constantly called a "whore" by her classmates. The third woman is an old lady, trying to live out her twilight years in peace.
I Had That Same Dream Again is finished and has 3 Volumes and 12 Chapters. It is also Known as: また、同じ夢を見ていた, I Too Saw the Same Dream
5. Tokidoki

What do you spend the time left of your life when it's measured in heartbeats? This is the story of Hato Iijima and Hatsu Takagi, connected to each other by a rare disease called "tempocardy."
Tokidoki is finished and has 0 Volumes and 1 Chapters. It is also Known as: 刻どキ, Toki Doki
4. Kimi wa Tsukiyo ni Hikarikagayaku

When I was in high school, I met a girl with a "luminescence disease." Knowing her time left was limited, she hoped to do the things she always wanted.
From the promise I made with her, my time, that had been at a standstill, began to move again.
You Shine in the Moonlight is finished and has 2 Volumes and 11 Chapters. It is also Known as: 君は月夜に光り輝く, Kimitsuki