"No matter how many times we're reborn, I'm sure we'll fall in love again. Because Kotaro and I are bound by the red string of fate." Kaede is a housewife, romanticist, and lover of peace, always one to avoid conflict. In fact, she and her husband Kotaro are so blissfully married that they've never even gotten into an argument. On the evening of her fifth wedding anniversary, as she heads towards the restaurant, she reflects on how much she appreciates her kind husband and the perfect marriage he's given her. But when a figure rushes in and attacks her from behind, her life begins to fall into disarray.