Yagate Kuromaku e to Itaru Saiteki kai - Vol. 1 Ch. 2.3

[Kampfarsch]

Do you really need me to say that “fucking security cameras” is not the only source of evidence for the (not so distant) future?

You know damn well they will keep throwing that excuse in there to continuously make him omnipotent
Making a character gain information or resources off screen in non descript hard to believe ways is just plain poor writing

At any given moment he can just know the future or spawn convenient things into existence because "he spent 10 years preparing"

 

[Mithgol]

Making a character gain information or resources off screen in non descript hard to believe ways is just plain poor writing

Those are not so hard to believe.

(If we go beyond the manga and read the novel, then the very first chapter mentions “piles of old newspapers”, for example.

The third chapter casually mentions a photograph.)