Hikari deserves happiness, Kuro deserves happiness, but, at this point, Koutaru needs to learn respect or responsibility or something.
Even besides the fact that he only cares about looks (curse, I'm assuming), he actively downplays the fact that his disregard to her situation will effectively doom her for the rest of her life, because it's not his problem. Then, on top of that, he's still going to get away Scott-free because author seems to like seeing a cast of all losing heroines...