Kazuichi Stronghold,
Fujima Jurou, the Bulwark Hybrid who'd been looking after Kazuichi pre-apocalypse, was assigned against his will to look after the stronghold while Arisu located Kazuichi beyond Yamanashi Prefecture. He knew just how dangerous and tense it was over there, but he didn't bother stopping Arisu since he'd most likely get hurt doing so.
Besides, Arisu already awakened the Blood Art, unlike him, which put her in a much higher rank compared to a Bulwark (for the most part, Hounds are weak against Bulwarks)
Although Fujima Jurou was Kazuichi's personal assistant in the past, he still respected his wishes not to go inside his place. Granted that Arisu had given him permission to do so, he decided to stay with the stronghold residents while he overlooked them.
"Sir!"