Nanairo no Shinwa
Rainbow Myth
七色の神話
One day, two high school students find that they are able to communicate to some of the dolls in the art room. The dolls tell them that the only reason they are able to hear them is because they are still "naive"/"childish". However, some events cause the girls to grow up and start losing the ability to communicate with the supernatural... (Source: Impossibility)