Responses
So I think it was actually hiroki who the wife thought the fl was trying to take from her. Maybe she saw them getting friendly and got jealous. This is just my theory bcuz of what hiroki says in chap 39, when referring to the fl he says "she fell in love with the same guy even after losing her memory", now how would he have known that about the fl, if the og fl had no friends & kept to herself all the time? Even keisuke didn't really know/interact with her till after the attack and fall
Ok, so I think im getting an idea as to what happened. So hear me out. The wife has postpartum and maybe she thought that our girlie was taking Keisuke away bc that was her only line of support with her husband being MIA due to work. Without Keisuke, she'd have no one to help or support her. She'd be alone. So, she confronts girlie with a knife on the roof. Its dark, hard to see. Just as she's threatening her and rushing toward her with the knife, Hiroki steps in and grabs the knife which is why his palm has that deep ass cut scar. As he's trying to take the knife, he accidentally backs into our girlie and she falls over the roof. But, he can't deal with her right away. He's dealing with his wife who probably just had another mental break over her realization of what just happened and what she did. So, im thinking Hiroki dealt with his wife first while calling the ambulance for our girlie. Wife isn't there at the scene of the crime bc Hiroki moved her. The ambulance arrived and he left with the knife. He wiped it down and tossed it bc he didn't want his wife to go to jail, clearly. And the blood that was found on the knife to be AB is his