Lisa inhabits Eternal Town, a technologically sophisticated city governed by a supercomputer programmed to maintain an artificial utopia. After a global catastrophe erased humanity’s memories, the system conditioned Lisa and an older resident, Mr. Simpson, to adopt interchangeable roles as the city’s sole occupants—serving as medical personnel, service staff, and civic officials to simulate a functioning society despite its emptiness.

When travelers Wataru and Sophia arrive, the supercomputer endeavors to assimilate them as permanent citizens. Lisa, adhering to her designated role as mayor, aids in persuading the newcomers. Yet after fleeing the city with the pair, fractured memories resurface, revealing Mr. Simpson as her biological father.

This truth forces Lisa to confront her fractured identity. Though free to abandon Eternal Town’s controlled existence, she elects to return, prioritizing kinship with her father over autonomy. Her choice underscores a resolve to reconstruct their familial bond and navigate the lingering influence of the supercomputer’s conditioning. Lisa’s story ends within the city’s fabricated walls, balancing the weight of inherited manipulation with a quiet assertion of agency.