Jiruo works as an instructor at Beruchoro Orphanage and holds the rank of Moon/Purple Whistle—one step below the elite Black Whistles, which qualifies him to train aspiring cave-raiders. He trained under Lyza The Annihilator, a legendary White Whistle, and has watched Riko grow up since she was a toddler.
He's known for running a tight ship. Jiruo doesn't let eager kids like Riko push beyond their limits, no matter how much they beg, and he's not afraid to smack children upside the head when they act out of line. That said, his strictness comes from genuine concern—he actually cares about the kids under his watch and does what he can to shield them from the Abyss's worst dangers. It's a delicate balance between being a demanding teacher and a protector.
Content compiled by AnimeList.moe from publicly available sources.
