Kanie Seiya, a genius with both looks, intellect and athletic ability is suddenly threatened on a date to a park by the new transfert student. Turns out, the park is run down and the princess managing it wants our narcissic MC to take over and save it!
By the author of Full Metal Panic! Oh, and there's Fumoffu too.
http://www.batoto.net/comic/_/comics/amagi-brilliant-park-r11139
