so Hachinoi Eiji really is the original, since he knows the past of Shinmiyoji, and Urashima Eiji doesn't know very much about her (as gloomy girl what he describes in chapter 1). Curious when Rei discovered the double personality of Eiji, seems she care for Urashima.
Oh, and I think actually Urashima tried to kill Kyouka, thus to "save her" from herself....