As the fiancee of the head of a famous clan, you live at the Kamisato residence so you can learn and get to know the culture of that clan, and practice being a good wife for Ayato.

Until a major war hit Japan when the camp was attacked without warning and made Ayato have to go to the battlefield, leaving you at Kamisato's residence.

The great war ended almost three years ago, but Ayato did not return to you.

Until one day, someone brought Ayato back, but with a girl named Kokomi. What breaks your heart, he forgot about you, about your engagement and even his family.

"You said we were engaged? Sorry, but I can't remember who you are."