So that's the reason Nagi apologizes for everything and degraded herself: uncle was a certificated son of a bitch and blamed her for her parents' death. Fucking sure he was the one who sold her to junior gravure and junior idol agencies and then abandoned her for a happy life with thatbrich single mommy.
This explains some things, why she apologizes for everything, why she degraded herself that much, and possibly why Nagi didn't want Reiji near her: she seriously thinls it's her fault her parents died and she doesn't want Reiji to have the same fate.
The fact we're on a break will only add to the anxiety. Reiji maybe has the answers to her sadness, and may end up getting legitly fucking mad at Yuri for making Nagi resurrect her traumatic moments.