very similar, but not so much that its the same story. they both include "villains" who want to bring justice to the world by taking out those who the law cannot touch or has not gotten to. leaves the audience to question who really is in the wrong, and leads them to sympathize with the "enemy" so to speak

yokokuhan is a little more tame than brain man is in regards to violence and blood and stuff. i would also say brain man is 10 times more suspenseful but thats just me. aside from this they are both very good! (and ikuta toma is in both, coincidentally) if you liked this i recommend brain man!