How is it that the most well known rivals of Ikebukuro can become lovers? Well, there is a...not so simple equation to it all. One man with a heart of gold that has a hard time with words and can’t hold a grudge against his rival. Plus an info broker that holds a certain interest to a monster and who also suddenly becomes possessed equals a couple that shouldn't even work...at all. But they somehow make it work, in the most complex ways.