High school students Mio Miyamasu and Arata Kishimo are childhood friends. Mio has feelings for Arata, but she does not have the courage to tell him. Even when her friend Madoka asks if she is in love with Arata, Mio reluctantly says no and encourages her friend to pursue her own feelings for him instead. Later, while Mio and Arata visit a fortune-teller, the boy notices a strange phenomenon and tries to drag Mio out of the shop—much to her annoyance. As Mio begins to question her relationship with Arata, an argument erupts between them. That night, feeling guilty for what had occurred, Mio ventures into the rain to apologize to Arata and make her feelings clear. However, an accident along the way turns Mio's world upside down.