After a catastrophic event submerges Yokohama due to Mt. Fuji's eruption, humanity's presence wanes. Alpha Hatsuseno, an android overseeing a quiet cafe near the city, steps into the role as her owner departs indefinitely. Despite the sparse clientele, Alpha exudes a sunny disposition. While awaiting her owner's return, she embarks on scooter rides and photography jaunts, encountering fellow androids and humans, crafting lasting bonds. 'Yokohama Kaidashi Kikou' delicately captures Alpha's serene routines, highlighting the gentle cadence of passing time in the mundane.