Everything you are seeing in a anime, videogame, movies, etc, are actually moving images on a screen, are idols like the religious paintings of antiquity, but as I said moving and not only that in the case of games, because you can control them, you control these idols. And these are idols, objects of worship, if you like or idolize a game, anime, movie, you are idolizing it, and that is sin. See, now for the worst part. For example, if you are commiting sin of idolizing a game and in a game you kill enemies who are monsters or demons, when you stop playing such a game, spiritually it may happen the case that you yourself will have to fight this monster and demon, but and how would you could fight a monster ? So these idolaters will be tortured by these videogame enemies who are also demons. You, your spirit, will have to fight them in the Sheol. And why ? Because you will not have the character or hero idol you controlled and used to kill these monsters and demons, so you will have to fight yourself, and you will pay the price of this sin.