The Ideal Sponger Life manga volume 17 features story by Tsunehiko Watanabe and art by Neko Hinotsuki.

A new era has come for the Kingdom of Capua, as Queen Aura delegates great powers to her new Prime Minister and Grand Marshal. And even though the Queen is still expecting her second child, Zenjiro is preparing for a very long voyage across the sea to the mysterious and icy Northern Continent. With the ocean teeming with monsters and the route demanding passage through treacherous waters, it's time for some special preparations, both magical and otherwise. It won't be long before it's time for Zenjiro to show his strength as a diplomat once again!