Upon his return from battle and a strange encounter with a monster-like man, The Captain is notified by his twin brother, The King, that their Guardian Deity no longer wants to protect the kingdom. To convince the Guardian Deity to change its mind, The Captain ventures out to its mountain lair and returns with the Guardian Deity's only condition to continue protecting the kingdom: The Captain must become his mate. (Source: Fantasista Inc.)

Ryuu no Otto: Boukoku no Kami was published digitally in English as The Dragon's Husband: God of a Ruined Kingdom by Fantasista Inc. through futekiya from December 7, 2020 to December 12, 2020.