Lisa Morisaki was Ryuji Morisaki's wife. She lived with a chronic illness that often confined her to bed, requiring constant care and restricting her activities. While Ryuji was away on a mission in 1963, she suffered a fatal accidental fall alone at home. Before her death, Lisa expressed deep concern for Ryuji's future happiness. She specifically asked him to promise he would live happily after she was gone, though he refused this request at the time. Her death devastated Ryuji, fueling a ten-year obsession to resurrect her. This quest drove him to seek entry into Agartha, the mythical land rumored to restore the dead. Lisa exists within the narrative through Ryuji's memories and the motivations they instill. Her background provides the emotional core for his relentless pursuit of the Gate of Life and Death. Her final wish for Ryuji's happiness went unfulfilled during his initial journey into Agartha, overshadowed by his consuming grief.