No toilet? Just build one!

Itsuki Honda, just an ordinary college student, suddenly finds himself transported to another world.

This isn't like the fantasy worlds he knows from anime; there are no elves, dwarves, or cat-eared girls.

On top of that, it was a world without even electricity or toilets.

He ended up living in such a world, but he never would have imagined he'd be forced to build a toilet.

Despite being bewildered by the drastic difference in living standards from the modern world, he somehow managed to utilize his past knowledge and aimed to improve his quality of life.