两位主角是在NDSS游戏《荣幸星 萌钻头》中初登场的原创角色宫河日向和宫河日影两姐妹，她们也曾在《荣幸星》的TV动画中登场。宫河日向是一个粉发眼镜娘，靠在同人店打工赚生活费，爱好大批购置漫画以及同人志，因此生活过得很艰苦。年纪较小的是宫河日影，发色是水蓝色，发型很有个性，因为姐姐日向大批购置宅物的关系生活过得艰苦，所以不太爱好御宅族，与姐姐过着打算着如何才干省钱的生活。
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