Ninymralei Stories

What if Koenji and Ayanokouji were different. What if the worlds of the genius prince's guide to getting a nation out of debt and the worlds finest assassin gets reincaranted into another world as an aristocrat joined classroom of the elite. All classes will have their geniuses but will fights ensue?

Male oc will be mischevious and in class B. There will be lots of crossover characters and maybe even an extra class