A story of friendship and conflict of two people named Yumi, which transcends time and space.

Single career woman Yumi Nakano and housewife Yumi Tamura watch each other's daily life in their dreams every night. Soon, their memory and present lives of become intertwined. A shocking case continuously take place. Meanwhile, Yumi Tamura's husband, Yohei Tamura falls in love with both women named Yumi.