Satou, an ordinary male student, was unable to confess his love to his childhood friend, Hime, but one day she suddenly announces she's moving far away. Satou chases after Hime and follows her through a gate of light into another world known as Arnulus!

Satou has married Hime and become the legendary Ring King who will save Arnulus from the threat of the Abyss King. They struggle to advance their relationship, but there's no time to enjoy their newlywed life as the Abyss King's pursuers close in.

Satou and the others have arrived in the elven homeland of Romca, the Land of Wind where he plans to marry Nefritis, princess of the Ring of Wind. Due to her shy nature, Nefritis vehemently refuses her marriage to Satou.

With the belief that the Abyss King's armies are closing in, Alabaster suggests they postpone Satou's marriage to Nefritis and head to another country. As they're departing an Abyss King's knight makes it past the barrier and attacks Romca.

Satou and company continue their journey for the next ring. Hime becomes jealous of Satou taking care of Nephritis. Soon after, a large caravan appears before them which is the Land of Fire, Needakitta. They ask for an audience with the princess, but...

Satou trains with Marse, hoping to beat Granart in the sword duel to court her. Satou is torn between facing her fairly to look cool for Hime, and prioritizing his duty as the Ring King. However, the Abyss King's evil clutches are approaching Needakitta.

Satou visits Maasa, the Land of Water, and unexpectedly ends up marrying Saphir, the Ring Princess. Saphir believes she needs the Ring King's power to save her homeland from being controlled by the Gisaras Empire.

The oracle who's secretly running Maasa the Land of Water offers some advice to Marse who failed in his mission. Satou and Sluder prepare to repel the approaching Abyss King's horde. As Satou struggles, a certain person suddenly stands before him.

Peace has returned to Maasa and the gang are able to take a short break. Satou and Hime go on a date alone, but Nefritis, Granart, and Saphir secretly follow them. Satou and Hime are enjoying their date, but then they recall Alabaster's prior words.

Satou and his friends head to Idanokan, the Land of Earth. However, having previously been destroyed in a battle with the Abyss King, the dwarves have abandoned the city. As the group searches for the Ring Princess that which they feared most occurs.

Satou and his friends have arrived in Satou's world with no way to return to Arnulus. Satou suffers from being unable to fulfill his duty as Ring King when Amber, the Ring Princess of Idanokan, the Land of Earth, appears before him

Satou and his friends return to Arnulus among countless corpses of imperial soldiers and monsters. Satou encounters the Abyss King in a hopeless situation. Using the Ring Princesses' power he challenges the Abyss King in a confrontation to save Arnulus!