The Truth Behind the Smile

This is a Robin Bars (a character from welcome to demon school iruma kun) angst btw also a little kalego x robin in this so if you don't like that then don't read,also pls don't hate :)

Robin Bars, the demon(?) sunshine and Kalego Naberius, the dark tyrant, are complete opposites, what will happen during their journey?
Well you'll have to find out yourself, good luck