I am so confused about Yotsuyu's backstory. It is different literally every time it is brought up.

First off, spoilers if you haven't done 4.2

The first major backstory cutscene we get is the conscripted impirial officer that the WoL catches. This calls upon the echo and we see a flashback where he is speaking with a woman and her son (presumably Asahi?). A young Yotsuyu approaches and the woman claims that Yotsuyu's family has dies and that she is her niece.

The next one is when we are confronting Yotsuyu and she herself tells us her parents mistreated her and then married her off to a rich old man the first chance they got. When he died, she was sold to a pleasure house to settle debts he had since incurred.

THEN we talk to the captain in the Doman Liberation Front and HE says that her FATHER sold her to the brothel.