Unnamed Memory, Vol. 3 (light novel): Vows for Eternity — Kuji Furumiya

The End of the Age of Witches As the conclusion of her contract with Oscar looms, Tinasha at last begins to realize her feelings for the young king. Unfortunately, not everyone is pleased to see love finally blossoming in her heart. An old rival of Tinasha's, the Witch Who Cannot Be Summoned, decides to seek revenge. The resulting clash between these two unstoppable, centuries-old forces heralds the beginning of a new era, but who will be left to greet it when the dust settles?