Wait can someone explain what happened to Satoshi at the end? Like why that happened to him.
Because Naomi had no paper to return with, Satoshi gave her his and told her that he had Yuka's from when he took it from her so she wouldn't lose it.
However, that was a lie and at the end when you see the guy who killed Yuka's ID card, it shows that Satoshi took the paper that he had and didn't have Yuka's
Basically he took the risk of not knowing what would happen if you used a strangers paper for himself and he died because of it.
That is waaaay tooooooo sad! But in my opinion, naomi was supposed to die as well because the paper didn't belong to her, no matter what. The ending was a bit of a disappointment.