In a quiet Japanese village, the life of a young student named Hikari takes an unexpected turn when he meets a classmate, Aoi. At first glance, Aoi seems like a normal girl, but Hikari soon discovers that she suffers from a peculiar amnesia that causes her to forget everyone she meets at the end of each week. Despite this challenge, Hikari feels irresistibly drawn to her vibrant personality and her ability to find joy in the small things.
As the days go by, Hikari decides that he will not let Aoi's memory be an obstacle. He embarks on a mission to win back her friendship each week, creating a bond that, while fragile, grows deeper over time. Their interactions are filled with heartwarming and bittersweet moments, where Hikari strives to make each week special and memorable for Aoi, knowing that every Monday they will start anew.
The story explores themes of young love, friendship, and the struggle against adversity, all wrapped in the beauty of human connection. With each repetition of the week, Hikari learns more about himself and the power of memories, while Aoi, though she can never retain her friends, experiences an intense emotional journey. Through laughter and tears, both discover that authentic connections can blossom, even in the most unusual circumstances. The film is a tribute to the perseverance of the heart, even as memories fade away.