Serious and reserved by nature, Yui is a shy girl who contrasts sharply with the urban, sexy aura of Rio. Their personalities could not be more different. Yui comes to visit Rio at her luxurious apartment, only to be taken by Rio's lover who already lives there. Soon after, she finds herself emotionally drawn to her former lover as well. Yet amid this tangled situation, Rio gradually begins to fall for Yui, and their relationship grows increasingly intense and intimate. This story captures how two women from entirely different worlds become entwined, drawn together through passion and desire.