They say a promise to the loved ones is never be broken till the very end but what if you don't know about the person you used to love anymore? Kai Iswaki, the protagonist met a girl named Mayu Suzuki in his childhood, who came to her grandma’s place for vacation in his town. They both became friends and played together, Kai shared a precious time with her and fell in love with her. Mayu Suzuki promised to visit him again but never came back to see him. After eight years, he met her again in his high school but she failed to recognize him. Kai Iswaki became friends again with her and started everything new but he soon felt something strange about her and why she doesn’t remember him. A teen sweet romance light novel.