Berserk and Lupin iii crossover

Huge W.I.P., I do not know how I will structure this or how long it will be, I will update the tags and warnings as I continue to write. My boyfriend proposed the crazy idea of a berserk and Lupin iii crossover, so I accepted and started to write one.-----The lupin gang are out and about trying to steal a very hot item that is key to the creation of an interdimensional portal. With pops on their trail, the group of four must act fast. In one wrong move, the group falls straight into the portal, pops tripping on his steps. What world the group finds themselves in is very.. different. Who is this massive raging guy with a sword he should not be able to pick up, let alone swing?? And is that.. a fairy??