One Liter of Tears - Japanese Drama Series

Credits to GMA Asianovelas

The only Japanese drama series that I could not help but cry.
One Liter of Tears is a 2005 Japanese Drama series starring Erika Sawajiri as Aya Kito and Ryo Nishikido as Haruto Aso.
The story is based on the real-life story of Aya Kito, an ordinary girl who was diagnosed with Spinocerebellar ataxia, an incurable generative disease, at the age of 15, but she continued her life until the age of 25. As time passes, she begins falling down often and walking strangely until she could no longer walk, write, speak and eat. The disease affected her body but not her mind.
Aya started writing a diary when she was 14 years old and kept writing to record her experiences and the symptoms she suffered. Her mother convinced her to publish her diary to give hope to others. The book entitled One Liter of Tears has sold over 1 million copies in Japan only.