Aida-san works as a waitress at a retro-themed diner in Neo San Francisco, embracing a 1950s aesthetic. This diner setting frames her primary interactions within the series. Muteki, the protagonist, experiences an immediate and visible romantic attraction to her upon their first meeting, a consistent element throughout episodes.

Her scenes with Muteki often feature her serving him ice cream sodas, a recurring motif that becomes a recognizable pattern in their encounters. This shared ritual shapes their evolving relationship.

Subsequent narrative events confirm Aida-san becomes Muteki's girlfriend, marking a distinct shift from their original customer-waitress connection.

A notable detail within her workplace is a locked door inside the diner. This door sparks speculation about a possible link to the city's mayor, though the specifics of this connection and any personal significance for Aida-san remain undefined.