There is no BHG- Kusari war or hostilities. Just a minor disagreement. Apparently over the pronunciation of "sushi".
The Kusari say it is pronounced "soo - shee". The Guild say it sounds more like "Filthy kimono wearing pig-dogs." I believe a minor fracas involving chop-sticks may have occurred, but it is a minor matter that wioll no doubt be resolved shortly.
Aside from occasional impromptu events like this, the Guild remains a truly lawful organisation dedicated to hunting criminals and would certainly never sponsor pirates or mercenaries to cause dischord in the Houses in the hopes of exploiting government weakness in order to garner large and profitable contracts. No sir.