This CG rip is provided by 2DJGAME CG Rip Group. Complete BMP Version with non-Event CG content is available in the blog below.
Japanese Game and Game CG Download http://orenogalgame.blog.fc2.com/ (Translated: http://translate.google.com/translate?sl=ja&tl=en&js=n&prev=_t&hl=en&ie=UTF-8&layout=2&eotf=1&u=http%3A%2F%2Forenogalgame.blog.fc2.com%2F )
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The purple(ish) eyed and haired girl from pages 91-141 is the protagonist's sister, left-most on the bench on the cover. VNDB says she's a brocon, same last name, etc.