An uncle and his niece share a mysterious bond. With no wife or children of his own, he has lived solely with Risa as his only companion. Over the course of ten years, an intimate world has formed between them, nurturing emotions that have grown beyond anyone else's understanding. Risa is an eighteen-year-old schoolgirl—innocent at heart, yet harboring hidden, complex feelings deep within. He adores her, and his affection sometimes stirs her, shaking her soul. Risa, too, is drawn to him, and their strange relationship is now evolving into something new.