One Week Friends S00 E02 Kaori's Journal - Monday, June 9th

High school sophomore Yūki Hase noticed that Kaori Fujimiya, his classmate, was always alone. He tried to start a conversation with her but was turned down: "My memories of friendship can last only a week," she said. Despite of knowing this shocking truth, Yūki keeps trying to be Kaori's "new" friend every week.