Konpei Asai begins as an 18-year-old high school student whose romantic life initially involves Eimi, facilitated by her friend Kirara Imai. Over the next six years, Konpei's relationship with Kirara deepens naturally, culminating in their engagement and planned marriage within the original timeline. This future is shattered when Kirara dies in a car accident en route to their wedding.

Following her death, Kirara's ghost is sent back eight years to the start of their acquaintance. Konpei, now existing in this altered past, interacts concurrently with his 18-year-old self, the younger Kirara, Eimi, and the 24-year-old ghost Kirara. Ghost Kirara actively interferes in the burgeoning relationship between the younger Kirara and Konpei, despite knowing their destined union in the original future. The manga references Konpei's fate after Kirara's death without detailing his character development or reactions. His role remains focused on the romantic entanglement involving both versions of Kirara and Eimi, with no additional information provided about his personal attributes, motivations, or actions beyond this central plot.