Hanabishi Kaoru is a junior in college, living out an ordinary life of studying and friends. One day, he meets a girl whom he discovers is his old friend Sakuraba Aoi, a girl whom he was supposed to have an arranged marriage with. Together, the two rediscover aspects of their pasts that they had tried to suppress while setting out in their lives with one another.

Unfortunately, there are a lot of unwanted guests that keep lurking around in their lives. How is their love going to unfold?