My Ability Is Called Love of a Fool

Ah, hello. I'm Tanizaki Junichiro. I'm just an ordinary student and an ordinary member of the Armed Detective Agency, the sort who's hopelessly obsessed with mathematics. For the record, I was recommended by my esteemed math teacher, who's an absolute madman. During the entrance test, he personally showed up with several grenades, planning to set them off to test me. His acting was especially terrible. What could I do? I'm just a weakling who can't even tie his own hands. I could only play along. "..." Tanizaki Junichiro raised his head, his eyes utterly blank. If someone who knew him had been there, they would surely have teased him for looking a little like his older brother. "All who are in love are fools." "It has always been so, from ancient times to the present." "Ability: [The Fool's Love]" "Naomi, show them what it means to transcend all things." "As you wish, big brother." Things to know about this story: 1. This isn't a traditional Tanizaki sibling story. It's a no-pairing, everyone-loves-him story [I'm so perverted]. Big brother only loves his sister. 2. Setting by @Cai Heqin on Lofter. 3. Happily hopping between fandoms, with lots of original headcanons. Theme: Big brother and little sister