Ring King Satou is off to the Land of Fire to find his third bride, but she's an incredibly strong warrior who won't marry anyone weaker than she is. In order to obtain the Ring of Fire, Satou will have to step into the arena and best this powerful princess! Determined to make Hime swoon with a demonstration of his combat prowess, Satou insists on fighting without the power of the rings. But with so little time to practice, can Satou really achieve victory?

Satou and his best friend, Hime, have been together for as long as he can remember. So when she tells him she's going back to her home world to get married, his first thought is to follow her and crash her wedding. All goes according to plan, and with a kiss from Hime herself, Satou becomes the new groom! But unbeknownst to Satou, the man who marries Hime is destined to be a hero of immense power and save the world! Is Satou up for the challenge, or is this just too much responsibility for one high schooler to handle?!

It's been a week since Satou and his brides found themselves locked in the Great Elven Library, and short of a serious power boost, their odds of escape are slim! To make matters worse, the scent of the Abyss has begun wafting in, and a new threat approaches...

As Satou and the Ring Princesses march toward their final battle with the Abyss King in Vanna, it’s up to Amber to guide them through the Dwarves’ labyrinth to the other side of the mountain. But when they enter the shafts, Amber begins acting strangely, leading the group deeper and deeper underground until they reach an abandoned city. Hidden in the lifeless walls are the last sentiments and wishes of the Dwarf Nation. How will their discoveries shape Amber’s future and the fate of the whole world?

Desperate to obtain the power of the Ring King’s legendary sword, Satou and Amber begin plotting to sneak into the Empire’s storehouse to steal it. However, two fearsome golems guard the way, and they’re far too powerful to overcome with strength alone! Meanwhile, Hime’s training in light magic continues, and just when she feels like she’s hit a wall, a mysterious young woman appears before her, offering guidance...but can she be trusted?

With the help of Amber, Satou and the other Ring Princesses finally head back to Arnulus, where a dreadful scene awaits them. Satou rushes in to confront the Abyss King, but he soon learns the power of the rings alone is no match for the darkness he's up against. He'll need his wives to pitch in, so it's back to Nokanatika for "bride camp." With her little sister Morion's guidance, Hime will learn to control the magic power that lies dormant inside her!

Sato followed his childhood friend to another world in order to marry her and became King of the Ring. But in order to save the world, he'll have to marry four other princesses?! Can Sato handle marrying a second wife?