So there was this anime called ‘fullmetal alchemist’.

The first scene is the then pre-teen main characters, two orphaned brothers, dismembered and splattered around the room after defying the laws of man and god in an attempt to resurrect their mother with illegal magic that went horribly wrong. It then cuts to a couple years later where the protagonist (now 14, and only diagetically glossing over the ‘child soldier’ of it all, as the absolute ruler of their vaguely Germanic central European military dictatorship is kind of a fatherly figure) with half his limbs prosthetic and his younger brother, a disembodied spirit bound to an old suit of armor, are working as military wizard-engineer maybe-counterintelligence are dismantling a cult in an city the state didsone atrocities to a while back, and being kind of unnecessarily shitty about it. the audience finds out its part of a bigger conspiracy, and by the end of the episode a shapeshifter comes into town and replaces the cult leader they had exposed as a fraud and killed (claiming he was an imposter) the moment our heroes leave.

This guy is from the episode where it becomes clear that the general tone of the show might be a little darker than previously suspected.