The Screaming Forest is a forest in which screams are always heard within.
While traveling back to Ev, Jack gave his condolences to the grieving Langwidere. Langwidere, angry at Jack for not expressing his feelings in the right form, threw Jack out of the carriage at the edge of the screaming forest.
Jack fell into a puddle and soon began to rust. He continued to walk deeper into the forest until he was completely rust and night began to fall. Langwidere, thankfully, returned to Jack with a can of oil. She oiled his body, causing him pleasure and took him back to Ev.