https://blog.wongcw.com/2020/03/30/%e7%b6%93%e5%85%b8rpg-%e9%81%8a%e6%88%b2%e3%80%8a%e5%b0%bc%e7%88%be%e3%80%8b%e5%b0%87%e6%8e%a8%e5%87%ba%e6%89%8b%e6%b8%b8%e7%89%88/