Youhei Nase used to go to Akihabara often when he was younger — not for himself, but for his little sister Yukana. Along the way, he became a devoted fan of game centers. One Christmas, a self-described proper young lady gifts Yukana a trip, and the two siblings spend it together as if they were a couple. Watching over Yukana during the trip, Youhei comes to a quiet realization: he has not truly saved his sister yet. A delightful and touching sibling love story — the second game in the series.