The only hint we get to something more is the mention of a dead "merchandise woman" and a panel of her obscured face. From there we switch back to Chihiro's PoV. He saves Hakuri, cheers him up, and everything seems fine as they plan the raid. Hakuri helps out and is put in a position to ascend

It's easy to forget Hakuri's victim status by ch. 32. We're reminded when he flashes back to talking about it with Chihiro and Shiba to explain why he's so sturdy, but it's quick and nothing we didn't already know. So that seems like the extent of his experience. Time for him to beat Soya!