|I'm looking for a manga where a character (preferably a main character) is obsessed with delivering his "justice" to the point where he blinds himself to anything else. Bonus points if the character is betrayed by his "justice" in the story as well.
An example would be Emiya Kiritsugu from Fate/Zero, who became a cold blooded champion of justice that would kill 100 to save 200 people
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, and, in the end lost his wife, daughter, and eventually his own life for the sake of his justice.
Another example is Takasu from fukashigi philia, who goes almost ballistic when he sees someone who stands in the way of his ideal justice of "cleaning up" of the city.
Edit: I prefer for it to be shounen/seinen.
"Onii-chan, I'm hungry. Won't you make me some dinner?"