jiri = inching backward

'It's just that we can't be separated because of the Seikoseki' = the magic Star Fox Stone (that Chibiko and Hii-chan each swallowed half of) forces Kurama and Hiei to be together after sunset. It also turns Kurama into Youko Kurama when the moon appears. For full details, start with 'Hiei's Revenge' and read on.