At the end of the sixth episode of Jinrui wa Suitai Shimashita the two drones in form of black panels have handles attached to them and placed in a wooden shelf with a note near them saying "1 hour of winding = 1 minute". It's not very clear from the characters' lines what this all means.
Can't drones recharge from electric sockets? I thought Pion just did at the beginning of the episode? Why resort to manual winding mechanism? What's really going on?