Keishi is just a normal high-schooler. His waifu is Aina, the heroine of his favorite game. Recently something changed in Keishi's life. He dreamt a lot of a girl with white wings calling him. Then he suddenly met a girl who looks exactly like Aina. Who is she? Did she come from another world? What is waiting for Keishi? In a distant world, a mighty female dragon is flying on a pursuit for her ultimate goal. She is looking for a person. A pet that can entertain her.