A fan of the novel horror stand-alone game "Endless Nightmare". The plot has been slightly changed, and the strategy plot in the game remains basically the same, but time and space are messed up. The adult Thomas jumps into a deep cave and meets his young self.
Marrying his own sister gave birth to a deformed and stillborn child, which made Thomas mentally abnormal and had to be admitted to a mental hospital for treatment. Ineffective treatment and his wife's desire to leave caused him to completely lose control and kill the people he loved and the people who treated him. He was rescued from a crazy self-mutilation but fell into a deep coma. In his dreams, he kept traveling between home and hospital seemingly endlessly, until he met himself who was pure and gentle in his childhood and only cared for his sister. As the two searched for their sister together, the adult Thomas was rescued bit by bit by the child Thomas, and they welcomed the light bit by bit in the darkness...