He worked his way up in the yakuza food chain starting form, sorry to be blunt, basically a sex slave. He had to use his body to get u and service but eventually he got to a place of power where he didn't necessarily needed to do that. When he died he just transmigrated into the body of one of the mob characters that were supposed to try and kill Eve but obviously as we all know something way different happened this time around it isn't clear if he's in the game or another world that looks like the game with predicted events from the game but I would lean more to the 'hes in a different world with predicted events from the game' cause I feel if he was in the game he wouldn't be able to affect the course of events and even if he did the end was already predetermined but that doesn't seem to be the case as he is clearly changing things quite easily even though he doesn't realizes it yet and still thinks that it's the game and every thing is already decided

Uhmm...this is the only thing i'm confused at, sooo when Gozu says that he alredy have "experience" is it from his past life or in this game? (but it's probably in the past right? Since when he was transmigrated he's already at Eve's house, but then, he could probably just remember the real Gozu's memories? Or in his past life since he was a Yakuza? Or something, and I think some things happened to him there??) so yeah, is it in the past or in this one??