oikawa is, of course, the grand king. however, he has a nasty habit of getting into wars he can never win, against a rival nation ( shiratorizawa ), and unfortunately, endless battles are costly. physically, oikawa was injured whilst mounted on a horse — a dagger was stabbed into his knee and considering that medical assistance at that time wasn’t exactly helpful, and that he was on the battlefield, the leg was amputated and he was given an ornate wooden replacement. economically, he found himself greatly in debt, though he’d raised the taxes on his subjects nearly tenfold to pay for all his wars. thus, it was necessary to take on a bride from a wealthy family. he’s presently engaged to shimizu, who will hardly talk to him because of his bad personality and overall annoying-ness, because her family gained quite some wealth after ( basically ) monopolizing the silk and spice trades.