Aiko and her best friend Eri spend all their time chatting on the social network Double.Me. They talk about everything but especially Dosan, a beautiful high school student whose two friends are in love. Alas, Eri dies. Aiko, deeply touched by the loss of her friend, sees the new application of Double.Me activate: an I.A imitates Eri. Aiko get then carried away by her virtual dialogues, but how far ...?