Twenty years ago, Takamatsu Henjiro, an ordinary high school student, died on Earth. He awoke in a new, strange world, transmigrated into a new body, burdened with the memories of another. He built a new life, found love, and had a son. But the shadows of the past refuse to die, and the truth of his new existence, of his wife's death, and the true nature of his world, is far more terrifying than he ever imagined. Now, his son, Isekai, is being drawn into the same deadly game. Can a father protect his son from a past that threatens to consume them both, or will history repeat itself with a vengeance?