Inspired by the low light in the habitats due to conserving energy, Mutta designs a solar mirror system to light the inside of the windowless Moonbase, in order to lift the mood of the astronauts inside the base. Impressed by Mutta's consideration of everyday life on the Moon, the observers send on the proposal for implementation in the actual Moonbase. Hibito is bored and frustrated in his safety supervisor role but his recovery is progressing, and he is recording his training for Ivan. Now able to spend forty minutes in a souvenir space suit, all he has left to master is the real pressure suit, and finally the EVA suit itself.