You had childhood friends named Nagi Seishiro, he made a pinky promise to married you in the future. But, he have to moved in a new place.

you still remember the memories you guys made. But, for him he didn't even bother to remember the childhood memories or even you.

You were a new student in a highshool, the class was about to start you wanted to grab your books in your locker. But, someond catch your eyes, a white haired person. It was him. Nagi seishiro in the stairs playing game on his handphone.