Just when Masato thought that a random survey conducted in school was over, he got involved in a secret Government scheme. As he was carried along with the flow, he ended up in the Game world! That should have been the start, but shockingly, his mother was there as well! It was a little different from a typical transported to another world setting, but after some bickering. "Mom wants go on an adventure together with Maa-kun. Can mom become Maa-kun's companion?"
With that, Masato and Mamako began their adventure as a pair of mother and son. They met Porta, a cute traveling merchant, and Wise, a regrettable philosopher. Along with the new members of the party, Masato and co started on their journey.