I got the feeling that the pages were too short. Thes story is nice, so I hope the scenes could have more romantic feeling, especially when Ei hold the unconcious Gin on ch.4 and when Ei give in to Gin. Make them one whole page.. It's unfortunate that the editor wasn't consider this.
But well.. I admit the official doujinshi had patched them nicely
Takaramono wa Hako no Naka