Is Onii-sama Mahouka guy? I've never seen it but it sounds like that would be it lol
I've forgotten about the show's name, but I guess that might be the case. It's that school that uses a mix of magic and technology, and onii-sama's just the strongest, sexiest, amazingest guy in the planet, to the point that even his little sister wants to get it on with him... and I saw all that in just three episodes of that crap.
MAL definitely needs to implement a unique Onii-sama rating tier just for that show.