Wait, her mother did what??
Her mother raped him, so when she killed her mother, he took it as an opportunity to do self therapy by helping her cover up the murder and becoming her guardian instead of actually dealing with being a rape victim
And now she is dragging some random kid into her own mess
Nobody called the cops ? Sorry, how is chocking a woman something he gets away with?
Japanese Cabaret clubs or Host Clubs are kind of grey establishments, usually with ties to Yakuza and other underworld organization which are the ones that manage and enforce security, supply the alcohol, and hire the hosts
As thus if something really serious goes down in there, it is not the cops that will come in but a "private security agency"
The clients also know this and would avoid getting involved in the middle of it all
Which is why nobody calls the cops, at worst the manager would have to ask what was happening not to check on the safety of the woman attacked, but to secure the experience and continued patronage of all the other clients, and since he stopped quickly after people started noticing him, then nothing had to be done, what matters is that they can finish the day without any incidents
And an incident is understood as any event that gets in the way to meeting the day's quota, a girl being chocked doesn't gets in the day of meeting the day's quota, so it doesn't counts as an incident, so there's no need to call anyone
On the other hand calling the cops, now that's a major incident, which would have stopped business for the whole day, and would have gotten in the way of meeting the quota for several days even