College freshman Natsuki and sophomore Yuki meet and fall in love one summer night--the first of many they spend together.

But as autumn approaches, Yuki suddenly tells Natsuki she wants him to be happy and find a cute girlfriend, then disappears from campus. Hoping to see Yuki one final time, Natsuki visits her home and learns she suffers from an unknown illness that forces her to sleep through the winter. This modern-day version of Sleeping Beauty explores the miracle of love.