How a Realist Hero Rebuilt the Kingdom (Japanese: 現実主義者は王国を再建する, Hepburn: Genjitsushugisha wa Ōkoku o Saiban Suru) is a Japanese light novel series written by Dogeza de Tanondemita and illustrated by Fuyuyuki. It began serialization online in October 2012 on the user-generated novel publishing website Shōsetsuka ni Narō. As of March 2021, nineteen volumes have been released.
The story follows Satou, an ordinary office worker with no ambitions or aspirations, as he is summoned to another world and tasked with rebuilding a fallen kingdom. Unwilling to do anything he's not interested in, Satou instead sets out to live life to the fullest in his newfound world.
Many have praised How a Realist Hero Rebuilt the Kingdom for its originality, interesting take on the isekai genre, and Satou's unique approach to problem-solving. The series has been consistently popular since its debut, selling over 1 million copies as of February 2020.