"1 Litre of Tears" is a Japanese memoir written by Aya Kito, a young girl diagnosed with spinocerebellar ataxia, a degenerative disease that affects coordination and balance. The book chronicles her struggles with the illness, detailing her emotional and physical challenges as she copes with the gradual loss of her abilities. The memoir gained popularity and was adapted into a television drama in 2005, further raising awareness about the disease. It highlights themes of resilience, family support, and the importance of cherishing life despite adversity, resonating with many readers and viewers around the world.