Hey, lookie here. Another Jiraishin reader. LOL!
But yeah, the ending seems to be based on Kyoya's shadow. But I do seem kinda interpret on how the shadow gets the color/shape I guess.
Based on how I did
http://www.fanfiction.net/s/4520292/1/Live_On...
Perhaps that there's not much Kyoya/Eriko on the last few chapters of Jiraishin, but thought...