Kekkon Yubiwa Monogatari

When Satou learns that his childhood friend Hime, a princess from a mystical realm, is to be wed in an arranged marriage, he rashly decides to follow her back to her world and crash the ceremony. His impulsive act leads to an unexpected twist—Hime kisses him in the midst of an attack by a dark force, thereby making him her husband and the prophesized Ring King, destined to save her world. With this new role, Satou gains powers that he never dreamed of, tasked with not only protecting Hime but also uniting with other princesses to fight against the malevolent Abyss King.

As Satou grapples with his new abilities and the responsibilities of being a Ring King, he must also forge alliances with the other princesses whose powers are vital to his success. Together, they embark on a quest to thwart the dark forces threatening their world, while Satou continues to prove his worthiness of the title and the heart of the princess he has always loved. This fantastical journey weaves together elements of romance, adventure, and heroism, testing Satou's resolve and the depth of his feelings for Hime.