G-Rail is a modern adaptation of the Arthurian myth of the Grail. Perceval Gallois arrives at a meeting urged by the sudden sickness of his mentor, Arthur Brenin. Gawain Hawk introduces him to a plan to save Arthur´s life by means of an extremely dangerous experiment. This leads him into an extreme and fantastic trip to endure G-forces, trascend the limits of human knowledge and discover the secret of the Grail.