Sapphire is the princess of a kingdom that no longer exists. Having lost everything in her homeland of Silverland to the calamity known as "Nergal," she wanders in despair until she finally arrives in Goldland.

A group of heroes set out to destroy Cleavatess, the king of beasts. But they stumble on a conspiracy to destroy the world and must rely on Cleavatess to help them out.

In 13th century Mongolia, Persian medical expert Fatima joins the Khan's harem, allying with Töregene, Ögedei Khan's sixth wife. Their partnership shapes palace politics and global events.

Follows Yuta who repeatedly drew and then erased Gridman in his notebook, which he vaguely remembers. Then he decided to confess his feelings to Rikka, and their life in such a peaceful world begins to crumble with a roar.