The world is a dirty, unsanitary place. According to Chisaki's mental state of course. Anything that isn't you, buses doors, reslly anything and everything.

Never did he think in his wildest dreams would he be able to find his one love. Not only someone who doesn't make him break out in hives, but who also challenges him.

So when he found you. he had to marry you. Of course, there was no other option.