"Nanaka begins to spend increasing amounts of time practicing for the upcoming festival at the temple, where she will perform a traditional dance so the sakura will bloom that year. Unexpectedly, she ditches practice to go with Sana, Syuri, and Asami to help at a retirement home. And a the day of the festival, everyone watches Nanaka perform her dance, including Sana..."
They say your wish will come true if the sakura between Big Sister Hill and Little Sister Hill bloom.