[Following the end of the anime]. The arms dealer Hayes has been defeated, Lux appointed as the personal knight of Lizsharte. Everything seems to be going well in the Crossfield Academy. However, Lux's "peaceful" daily life will not last for long. The former prince still has to realize his own feelings and fight the darkness lurking around, to open the path to a golden future.

Lux, after taking a fatal blow, makes a wish to go back in time to fix everything. His wish is granted, and this is that story.

Kaori Miyazono and Kousei Arima couldn't be more different. However, when a mutual friend brings them together per Kaori's request, Kousei's monotonous world gets turned around into one of color. Switching Kousei and Kaori POVs, slight AU.