Shizaya's Daughter

Shizuo and Izaya were living a nice happy life since they both confessed their rather strange feelings to each other.
Well...
It IS Ikebukuro, nothing is nice and peaceful and trouble is still brewing up at every corner.
And everything gets even more riled up since Shizuo found a little girl in an alleyway all alone.
And now Izaya is attached to the child.
What will happen next to our hero's in Ikebukuro?