Hmm... those expressions of surprise from the 2 bitches makes me suspect that
@WeebKun may be right in their theory.
That being that the 2 bitches where just trying to keep Yuu away from the show biz out of some twisted attempt to protect him.
For a possible conflict we may also get that they may want to have Yuu for themselves after seeing him being good as manager. My few ideas:
1) Twins are just straight up boring evil assholes - I hopw we won't get it
2) They had mix of being annoyed at Yuu as children (because he is not even good and gets casting from nepotism), as well as thinking he is not at fault for not having talent and being pushed here so they harassed him to save him face - I kinda like it
3) They were annoyed assholes, but now when they will look closer at how hard he works and after finding about his situation they will want to have a contact with him or even get him for themselves - it may give us the most action and tension between twins and sisters