21 Emon is the twenty first descendent of the owners of the old, run down hotel The Tsuzure Inn. Instead of carry on the family business, what 21 Emon really wants to do is pilot a rocket ship and explore space, which he manages with laughs and comedy in this science fiction adventure series.

21Emon, the 21st descendant of the Tsuzure Inn, dreamed of becoming an astronaut. While being strongly opposed by his parents, he tried to realize his dream and finally set out on his journey into outer space. However, his difficulties continue as he rides the rails in a 21st-century sort of way such as by hitching rides on rockets.