To escape his longing for his younger sister Hana, Yuuichi Mitsui enrolled in a university distant from home. Yet the distance only deepened his longing, and he still feels shame for forbidden thoughts when one summer dawn, Hana unexpectedly arrives at his door, looking more radiant than ever. Although she has grown physically, her mind remains childlike. Yuuichi strives to restrain himself from touching his naive sister, but the task proves difficult as Hana"s innocence and naivety make her irresistibly alluring. His heart pounds with each step she takes, as if the very air around her is charged with forbidden promise. He cannot ignore the pull today.
