The story revolves around a college student named Mizuho Suga. She attends the funeral of her childhood friend Haruki Origuchi and sees her high school classmate Hikaru Narumi there. Back in school, Hikaru had a reputation as a notorious womanizer. However, there was always a special connection between him and Mizuho. One kiss, one small trip, a few secret dates. They were neither friends nor lovers, but they forever cherished the memory of this closeness.