Watch Little Fish (2020) online

Little Fish, directed by Chad Hartigan, tells the story of a young married couple, Emma (Olivia Cooke) and Jude (Jack O'Connell), who find themselves dealing with a global pandemic. The virus, called NIA, affects the brain and leads to a progressive loss of memory, as a result those who are infected begin to forget everything and do not recognize loved ones.
When Jude contracts the pathogen, Emma will try in every way to remind him of their love in the hope of keeping alive in her memory the strong feelings they had for each other.