Yeah, it was obvious it was him once Chiyu was brought up as a suspect.

Kuroyuki was damn cute with all her flustered, jealous behavior, even going so far as to intentionally get a shorter cable. The key scene was how shocked and upset she was getting because Haruyuki kept saying he should only be used as her slave and cast aside.

With the car crash (and all the very odd censorship...why censor the driver's face even after identifying him verbally?) I figured that she was going to die in a cliche way or be in the hospital for months in a coma, but thankfully, medicine has advanced to the point where even an accident like that and the large amount of blood she lost isn't fatal. She'll only be in trouble for a few days at the most by the sound of it. I'd still be worried about brain damage, but the author either forgot about that, or it's covered by the same medical advances.