[Anime Crossover] The Child of a Mary Sue Everyone Loves

As the product of a political marriage, I had a very clear idea of my place in the family. But I never imagined my mother would be living out the script of a universally adored Mary Sue, bringing me a whole bunch of younger brothers! When I was twenty, my oldest younger brother messaged me to say he'd joined a Black Organization. When I was twenty-five, someone told me they'd seen my second younger brother join a Black Organization. When I was thirty, I learned that my third younger brother, whom I'd only just heard from, had already spent three years in a Black Organization. When I was thirty-five, the youngest brother I'd raised as my own son, only fifteen years old, suddenly told me he was joining a certain Black Organization. The four Black Organizations: trembling as they face another day on the verge of being wiped out I was silent for a long time, then dug out the contraband I'd long since stopped using. I planned to blow up the headquarters of the Black Organization hiding behind a seafood company front. Why do my younger brothers always have to run into the arms of a Black Organization?! I'm a government employee! My junior colleague, who'd just been promoted to the bomb squad, listened to me vent, took malicious delight in my misery, and brought me a boxed lunch. Life is short. Whatever it is, talk about it after you've eaten. The story opens when the protagonist is over thirty. There's basically no romance. Theme: I will eradicate all evil and darkness and usher in the light.