Thread:Ollerus/@comment-5275759-20190420222036/@comment-24758887-20191003050512

Is this right Sandbox what you are looking for? For the terminology, 第二少年院 is used in the preview chapter for Jailbreaker Arc which released in September 2017. In chapter 98, director mentioned Reformatory as 第一少年院. He mentioned same terminology (第二少年院) in chapter 100 and chapter 105. Even in concept art for Railgun manga Vol. 14, same terminology (第二少年院) is used. English translation translated "第二少年院" as Second Juvenile Hall and "第一少年院" as First Juvenile Hall.