Aiko and her best friend Eri spend all their time chatting on the social network Double.Me. They talk about everything, but above all about Dosan, a handsome high school student both are in love with. Tragically, Eri dies. Aiko, deeply affected by the disappearance of her friend, then sees a new Double.Me application come to life… in the form of an AI imitating her deceased friend. Aiko lets herself get caught up in these virtual conversations, but just how far will she let them take her?