But it was he who decided to admire "god". Light didn't force him to join the party. So it was
his will that was following Kira, and his will that helped Kira in time of need. Kira
needed someone like Mikami. And it was Mikami's
choice to help him and he retained his own right to make decisions; it was his decision to take out the notebook at the precise moment. Yes he was an instrument for god, but he did everything according to his
own will with his
own decisions, especially considering that Light trusted him to make the right decisions in the end.
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