One day, suddenly, an angel came descending from the sky?!

While heading towards his university entrance ceremony, Inchinose Yuu meets an unsociable, mysterious girl, Nanase Yuu. Yuu, who can't help but be curious of her — who is as free-willing as a stray cat — gradually shortens the distance between them. As various feelings mix around, their bond gets spun together, but what can be seen beyond that is…