[Mashiro no Hihoukan (Labui)] Transsexual Time Slip!?

After a mysterious time machine malfunction leaves them stranded in a primitive age, a man and a woman find themselves facing a reality where their physicalities have been unexpectedly altered. As the implications of their new forms settle in, the duo must navigate a world where a simple button press can conjure gadgets, yet their new bodies present a constant, distracting presence. What began as a chaotic escape through time turns into a daily life filled with surprising biological changes and the unexpected tension of living in a new, strange era.