"Ai Uta: Yakusoku no Nakuhito" is a Japanese film that tells the story of a young woman named Nana who is diagnosed with a terminal illness. Despite her condition, Nana decides to live life to the fullest and falls in love with a man named Kyohei. The two of them make a promise to each other to always be there for one another, no matter what. However, as Nana's health deteriorates, Kyohei struggles to keep his promise and must come to terms with the reality of their situation. The film explores themes of love, loss, and the importance of cherishing every moment."