Yoko is currently taking money from simps...Shinji, and all the others that give her money....Asuka if her mom is good and well she will probably marry one of the sons from Her work (I mean some rich heir from the whole circle of contacts Helen has) Helen is worse for MC right now... and that is because she holds him by the balls literarly)
Yoko
the girl needs to live on something. she has no qualifications other than to wiggle her ass. it's obvious that she didn't get along with her family, if you took the trouble to listen to the tearful story of her life.
and the fact that she screws simpletons - there is an expression "when you chop down a forest, chips fly" - I can even understand her when she screwed Shinji, how did she know that this fool threw all his money at her? her target audience is rich perverts, who can be milked for donations for a long time. and Shinji is collateral damage, alas.
if he had been more careful with his own money...
"three wise men in one basin
set off on the sea in a thunderstorm...
if the old basin had been stronger -
our story would have been longer!"
if something like that is an epigram for my entire comment.
but if you think about it well and deeply, then Shinji is like that too - and how can he be without a mother, if he has a sister instead of a mother, who herself is not much older than him, does she have much of her own life wisdom? namely, not much, she hasn't had time to acquire it yet, so she had nothing to share with her brother - and her younger brother (almost) found himself alone with this cruel world (in the form of Yoko-Caramella, who is also trying to snatch a penny for living, and also spins around without sparing herself or others).
the situation is rough but also sad and there are no real culprits here. Yoko and Shinji (even Nanali) is a victim of circumstances.