Ai & Marco were a great duo, I actually liked them, even though I don't really got their motivation. Like, why didn't they just break Yuno's and Yukki's phones right away, and instead went for confrontation, that's kinda bs to me. Also, I wonder who was the one calling Yukki's father with the offer for exchanging his son's life for cancellation of his debt...
I'm actually sad Yukki's mom died, she was real nice. And killed by her assohole ex husband, that makes it even worse!