In fact, at the beginning, Ya Shida called Mariko into the room. What he said to Mariko was: Grandpa will die soon, let Mariko inherit the inheritance, plus get close to Wolverine, and then introduce Wolverine into the tower when necessary, and bring King Kong. The power of immortality of the wolf is instilled into Mariko, and grandpa has arranged manpower to help you.
Mariko also did this all the time, even giving up his body. In the movie, you can see that Mariko is not worried or nervous at all whether she is caught by the gang or threatened to be killed by her father, because this is exactly her original plan to use Wolverine's sense of justice to attract him.
But at the end, things went wrong. When Mariko pretended to be held tightly in the tower (in fact, she also knew that her ex-boyfriend would not hurt herself), she realized that it was not herself who wanted immortality. At this time, she became anxious and calmed down. Nothing, even if he deceives his ex-boyfriend, he has to run to get strength.
When she ran away, Yashida was absorbing Wolverine. She attacked her grandfather with paws without saying a word. As a result of the attack, Wolverine was put down and saved. Her reaction here was normal, but afterwards , She then kept poking her paws into Grandpa's neck, which made her show her true shape. After all, it is possible for a young girl to attack her grandfather for the sake of her lover, but it is very unusual to be able to poke her paw into the neck of her grandfather who has always loved her so cruelly. At that time, she should have the following considerations:
1. Grandpa deceived her. She thought that grandpa was dead, and it was herself who inherited eternal life, and she was angry.
2. Grandpa absorbed immortality and became younger. Not only is there no hope for immortality, but also the inheritance is gone, and he is angry.
3. If Grandpa is alive or able to speak, he will definitely expose himself and cause Wolverine to distrust himself.
With the above three thoughts, Mariko poked at Grandpa's neck.
At the end of the film, Mariko asked Wolverine affectionately if he could stay. In fact, she wanted to keep Wolverine by her side, and slowly looked for opportunities to rob him of his eternal power. After all, she was still young, not in a hurry, and grandpa was still young. To be able to create this kind of machine, as she is now the group's agent, creating this kind of machine is also a matter of time.
The above is my understanding of the film, there is no black belly, just a normal speculation.
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