This is the third volume in the saga of our beloved “sponging protagonist,” and at this point, “sponging” is the last thing he’s doing. A year has passed since his marriage to Queen Aura of Capua, and the capital has welcomed their new child and heir to the throne, Carlos Zenkichi. The kingdom is busy with festivities to celebrate the happy news, but something more ominous has reached Aura’s ears. Margrave Gaziel tells her that his territory has had no salt for a year, and with his lands lacking both sea and rock salt, it could spell the region’s end. While the queen immediately orders an investigation, Zenjirou’s free time is becoming more than he can handle in the inner palace, and he starts to investigate what advancements might be made to move their nation forward.

When he chose to leave Earth and marry Queen Aura, Zenjiro learned that his blood carried an otherworldly ancestry...but it turns out his family tree had more secrets than anyone imagined. The children he and Aura hope to have together could upend the world's peaceful order, bearing powers no one expected. It'll take all of Aura's cunning to navigate intrigue between kingdoms, even while Zenjiro prepares for the possibility of a new addition to their royal family.

Two years have passed since Zenjiro was summoned to a kigdom in another world and married its beautiful queen. Now, Zenjiro and Queen Aura celebrate the birth of their child--the young First Prince of Capua---and the realm celebrates with them. Yet while Zenjiro is busy adjusting to his new life as a father, a bloody massacre breaks out along the vital Salt Road. A company of knights and warriors rides to do battle with all manner of wyverns, even as a delegation arrives from the Twin Kingdoms with an agenda all its own!

Yamai Zenjirou is your everyday office worker in modern Japan. One morning, he suddenly finds himself summoned to a tropical world where dinosaurs roam the land. He is told that this is the kingdom of Capua and the person who summoned him - its monarch, Queen Aura - wants him to marry her and leave his old life behind for a life of carefree extravagance as her prince consort. The reasons for her offer are many and varied, but she needs an heir, and she wants him to be the one to provide it! If he accepts, he’ll never have to work again, lazing around in luxury with no worries other than securing the kingdom its next monarch. Certainly, sleeping with the buxom beauty is far from a hardship, but is everything really as it seems? He’ll also need to give up everything he knows on Earth. Is he ready to drop it all at a moment’s notice for her sake? And how well will he be able to navigate the politics, people and culture of this new world if he does?

PLENTY OF FISH IN THE SEA A young girl calling herself Princess Freya arrives in the Kingdom of Capua, claiming to have sailed from across the northern sea! With Queen Aura preoccupied with matters of state, Zenjiro is sent out to the port city of Valentia to see if he can establish profitable trade between the continents. It’s Zenjiro’s first-ever journey out of the royal palace...what could possibly go wrong?

Two months have passed since Zenjirou accepted Queen Aura’s proposal to leave his old life and world behind, and to build a new one as a “sponger” with her. Since their wedding, he’s spent his days luxuriating in the comfort of their relationship, but it seems that carefree life isn’t destined to last. Between his introduction to high society, the question of concubines, and a native disease, he’ll soon have to pay back the debt incurred by those first easygoing months in full. All this and more demands Zenjirou’s attention, and in a complete reversal of fortune, his days go from being entirely uneventful to being overwhelmed by a mass of responsibilities and considerations all vying for his time. On top of everything else, there’s a secret missive from the Twin Kingdoms of Sharou-Gilbelle. Just what does that missive contain, and what new matters await the unlikely prince consort and his queen?

Burdens on both Aura’s time and body mean it’s finally time for her to appoint a prime minister and marshal. While the lightening of the load couldn’t be more welcome, the risk of those appointments pushing the country away from her control is stronger than ever. With both that potential and her husband’s future in mind, she grants Zenjirou a dukedom to help maintain the balance of power. Coupled with even more guests from the Twin Kingdoms, the prince consort is in for a fair amount of personal upheaval, but now his wife wants him to head to the Northern Continent with his likely concubine-to-be as well! It’s going to take quite a bit for Zenjirou to feel comfortable with the journey, but their current guests just might have the solution...