Win Kirifuda lives as a high school student in Tokyo with no memory of his life before the age of sixteen. One day, after obtaining a new Crystal Card, a fragment of memory flashes through his mind—an image of a lighthouse that matches a photograph hanging in his room. This lighthouse is in a place called Shirahama, and the vision stirs something deep within him. Meanwhile, the Lost Field, a dangerous boundary zone where creatures from the card game manifest freely in the real world, continues to expand, warping the environment and threatening ordinary life. Determined to recover his lost past, Win sets out for the lighthouse alongside his friends Niika and Tsukumoya Wayumi. The journey pulls them into the heart of the mystery behind the Lost Field's origin, the true nature of the creatures that roam it, and the silent, watchful presence of the sinister Abyssbell Jashin Emperor, whose motives remain unclear. Win must confront not only external threats but also the void within himself, piecing together his identity through battles that blur the line between card duels and reality. The story follows this quest across a landscape haunted by forgotten memories and encroaching darkness, leading to a confrontation that will decide the fate of both the human world and the creature realm.