Suikama was only a child when suddenly his legs were handcuffed and he was kidnapped. He managed to escape, but he never got the keys for the handcuff, so his legs were stuck together, this made it difficult for him to stand so his basically was sitting his whole life. This sucks because he can't chase after his dream to be a horseman as it's quite difficult for him to sit astride something. He was murdered later, Ha ha, old chap!!
Even if I got the kidnap part right, there's probably still some more details on the murder, right? :V