One litre of tears (1 litre no namida) tells the heart felt story of Aya Kito who was diagnosed with Spinocerebellar ataxia at 14 years of age. The diary follows her through her ups and downs as she manages her condition, and struggles through daily life as the disease slowly and cruelly progresses. Its timeframe is set from her teenage years right until young adulthood where tragically, she passed away at 25. Despite how Aya felt, she kept penning her diary until she could no longer do so.