Hotori, a young girl afflicted by a progressive, fatal disease marked by swift memory deterioration, steadily loses grasp of her past and sense of self. Isolated and confined to the sterile seclusion of her room, she navigates a shrinking world until forging a bond with Suzu—an android implanted with fabricated memories to substitute a deceased child. Their connection blooms from opposing realities: Hotori’s mind unraveling as Suzu’s identity is constructed through artificial recollections. Together, they confront the fragility of existence, questioning whether selfhood is shaped by transient experiences or imposed narratives. As Hotori’s condition accelerates, their friendship intensifies, forging a poignant pact that anchors their fleeting moments. Residing in a clinical facility where her illness is monitored but not halted, her story centers on this fragile present, her history before confinement left unspoken. The narrative hinges on her evolving relationship with Suzu, each encounter a mirror reflecting their shared struggle to define meaning amid erosion and artifice.