All the debate about being drunk meaning it was rape... no, that's not how that works, having sex while drunk is not automatically considered rape. When someone manipulates a drunk person into sleeping with them, that is rape. the reason drunk rape is considered rape is because alcohol inhibits your decision making and your rationale, it's then considered that getting someone drunk or taking advantage of their inhibrieted state to have sex with them counts. If a drunk person makes the advances to someone who wasn't involved in getting them to that inhibrieted state, who is not as drunk as them, then it is a blurry line depending on what happens after which is to be settled in a case by case basis.
Here the line is blurry, first it seems Blade was also very drunk and there's no indication that he wanted to take advantage of Karina, then when it comes to Karina having sex with Harumi it is not left completely clear, and I am not a lawyer, but if Karina is fine with what happened and as it seems she made the first step towards Harumi, there's little concern to be had.