Lisa Morisaki, the late wife of Ryuji Morisaki, battled a chronic illness that frequently confined her to bed. When her husband contracted a fever during an unspecified period in 1963, Lisa tended to him despite her own frail condition, imploring him to vow to embrace happiness after her death. He refused, insisting they would return to Japan together after his mission. Her life ended abruptly when she fell from her bed in his absence, a trauma that shattered Ryuji, fueling a decade-long obsession to locate Agartha—a mythical underworld—where he believed the Gate of Life and Death could resurrect her. His relentless pursuit of reversing her fate became the driving force of his existence. In the story’s climax, Ryuji activates the Gate’s power, channeling Lisa’s spirit into Asuna’s body. Through this temporary possession, Lisa’s essence reaches out, pleading with Ryuji to relinquish his quest and find peace without her. This spectral encounter becomes the pivotal moment that fractures Ryuji’s resolve, steering him toward accepting her irreversible death. The narrative confines Lisa’s presence strictly to these events, framing her primarily as the emotional cornerstone of Ryuji’s arc rather than expanding her character beyond her illness and spousal bond.