Escape from Puroland explains what he was doing there.

Bob's been assigned to work with the Miyamoto Group, checking the wards that lock down Japan's warded sites--a task previously handled by his predecessor Dr. Angleton, the Eater of Souls. This mostly involves policing yokai: traditional magical beings, increasingly grown more annoying and energetic.

But then Bob's simple trip turns into a deadly confrontation with the ultimate yokai. It's massively powerful. It's pink. And it says Hello.