Niini no Koto wo Wasurenaide (2009)

Description:

Kawai Keisuke is a young man who aspired to become a physicist since he was young. His hopeful parents send him to an expensive college prep school, but at the age of 15, during his third year of junior high, he is diagnosed with a brain tumor. Told that he only has one year to live, he falls into despair, giving up on treatment and even lashing out against his own mother. Ultimately, with the support of his family, he struggles with the tumor for eight years before dying at the age of 23.